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Marijuana Prevention Initiative

Key Data: Marijuana Prevention Points of Consideration
The Marijuana Prevention Initiative (MPI) works with partners in each of San Diego County’s six
regions to reduce youth marijuana use and increase knowledge of its harmful effects. This
document provides selected county, state, and national data regarding youth marijuana use
and related health and community impacts. These data points provide relevant marijuana
use/perception statistics to help inform marijuana prevention efforts currently underway across
San Diego County.

San Diego County Data
Youth Marijuana Use

Increased
Trend

The percentage of 9th and 11th
graders who reported using
marijuana in their lifetime has been
increasing since 2007.

 In 2011, approximately 26% of 9th
graders and 39% of 11th graders
reported they had used or tried
marijuana sometime in their life
(CHKS, 2009-2011).


Increased
Trend





Use among 7th graders has not
changed substantially over the past
10 years. On average, nearly 10% of
7th graders reported using
marijuana sometime in their life,
and approximately 5% reported
using it in the past 30 days (CHKS,
1999-2011).



Approximately 24% of high school
students in the San Diego Unified
School District reported that they
are currently using marijuana, and
over 8% reported that they have
used it on school property in the
past 30 days (CDC, 2011).



Nearly 11% of high school students
in the San Diego Unified School
District reported trying marijuana for
the first time before they were 13
years-old (CDC, 2011).

Approximately 1 in 5 high school
juniors reported using marijuana
sometime in the past 30 days
(CHKS, 2009-2011).
The percentage of 9th and 11th
graders who reported smoking
marijuana in the last 30 days has
increased 50% from 2007-2011
(CHKS).

Access to Marijuana and Perception of Harm


Approximately 70% of 11th graders in
San Diego County reported that
marijuana is “very easy” or “fairly
easy” to get (CHKS, 2009-2011).



From 2009-2011, the percentage of
students who believe that smoking
marijuana is very harmful has
declined (CHKS).



High school students in San Diego
County (9th and 11th graders)
perceive occasional marijuana
smoking as less harmful than
occasional cigarette smoking
(CHKS, 2009-2011).



Approximately half of San Diego
County 7th, 9th, and 11th graders do
not believe that people greatly risk
harming themselves when smoking
marijuana once or twice a week
(CHKS, 2009-2011).

03.20.13

Funded by the County of San Diego, Health and Human Services Agency

1
Marijuana Prevention Initiative


Although relatively few young people
believe that smoking marijuana is
harmful, approximately 80% of San
Diego County adult residents believe
that smoking marijuana daily or
weekly is harmful to one's health
(Community Perception Survey, 2011).



Approximately 34% of San Diego
County adult residents perceive
recreational marijuana use to be a
problem in their community
(Community Perception Survey, 2011).

Treatment Admissions Data


The average potency of marijuana has increased sixfold since 1978, which may
contribute to higher rates of youth addiction (NIDA, 2009).



Marijuana is overwhelmingly the drug of choice for adolescents admitted into drug
treatment programs, with approximately two-thirds of all adolescent admissions due to
marijuana use (County of San Diego Strategic Prevention Plan, July 2011).



The number of adolescents in San Diego County treatment programs for marijuana abuse
has doubled between 2004 and 2008, from 738 to 1,579 (CARS, 2010).

Implications of Marijuana Use Across California and the U.S. 1
Drugged Driving


Only 11% of people who tested positive for THC (the psychoactive ingredient in
marijuana) in the California Roadside Survey believe that driving under the influence of
marijuana is harmful (OTS, 2012).



Cases involving driving under the influence of marijuana are more likely to settle, not be
charged, or be dismissed than those involving alcohol (Tashima and Hanson, 2011).

Driving Under the Combined Influence of Alcohol and Marijuana


California drivers are as likely to test positive for THC as alcohol (OTS, 2012).



Approximately 25% of persons testing positive for THC in the California Roadside Survey
also tested positive for alcohol or another drug (OTS, 2012).



Severe marijuana-induced driving impairment is observed with high doses, chronic use
and in combination with low doses of alcohol (Couper and Logan, 2004).

Implications of Drugged Driving


Driving under the influence of THC is associated with (Couper and Logan, 2004):





03.20.13

Decreased car handling
performance
Increased reaction times
Inability to maintain headway
Subjective sleepiness





Motor incoordination
Impaired time and distance
estimation
Increased lateral travel

Funded by the County of San Diego, Health and Human Services Agency

2
Marijuana Prevention Initiative
Academic Achievement 1


Among adolescents, marijuana use is associated with attention and memory problems,
slower brain processing, and difficulty with problem-solving – all of which may affect
academic performance (Medina et al., 2007).



Heavy marijuana use is associated with higher rates of skipping class, lower GPAs, and
failure to complete college (Arria et al., 2013; Hunt et al., 2010).



Adolescents who have smoked marijuana more than 100 times are less likely to enter
college or earn a college degree and are more likely to drop out of college than their
peers who have not (Fergusson et al., 2003).



Middle and high school students (ages 12-17) with an average grade of “D” or lower
reported significantly higher rates of current marijuana use in the past month compared
to those with an average grade of “C” or higher (SAMHSA, 2009).



Young adults (ages 18-23) who did not complete high school reported significantly
higher rates of current marijuana use than those who completed high school (SAMHSA,
2009).

Impact on the Developing Brain1


Smoking marijuana is significantly associated with the onset of psychotic disorders,
particularly schizophrenia (Large et al., 2011; Moore et al., 2007; Semple et al., 2005; Veen
et al., 2004).



Children and adolescents can become addicted to marijuana more often and more
rapidly than adults because their brains are still developing (CSAM, 2012).



The combination of marijuana and alcohol is more addictive in adolescents than in
adults (Muoio, 2012).

Data Sources
Arria, A. M., Wilcox, H. C., Caldeira, K. M., Vincent, K. B., Garnier-Dykstra, L. M., & O’Grady, K. E. (2013).
Dispelling the myth of “smart drugs”: Cannabis and alcohol use problems predict nonmedical use of
prescription stimulants for studying. Addictive Behaviors, 38(3), 1643–1650.
California Society of Addictive Medicine (CSAM). (2012). Impact of marijuana on children and
adolescents: Evidence-based information on cannabis/marijuana. Retrieved March 03, 2013, from
http://www.csam-asam.org/sites/default/files/impact_of_marijuana_on_children_and_adolescents.pdf
Center for Disease Control (CDC). (2011). Youth risk behavior surveillance system (YRBSS). Retrieved March
04, 2013, from http://www.cdc.gov/HealthyYouth/yrbs/index.htm

The following data derive from national research studies and may be of great relevance to regional prevention
providers in San Diego County.

1

03.20.13

Funded by the County of San Diego, Health and Human Services Agency

3
Marijuana Prevention Initiative
Center for Applied Research Solutions (CARS). (2010). Indicators of alcohol and other drug risk and
consequences for California counties: San Diego County. Retrieved March 05, 2013, from http://www.cacpi.org/docs/County_Data_Files/San_Diego_10.pdf
Couper, F.J. & Logan, B. K. (2004). Drugs and Human Performance Fact Sheets. Prepared for the National
Highway Traffic Safety Administration. Retrieved March 12, 2013, from:
http://www.nhtsa.gov/people/injury/research/job185drugs/technical-page.htm
Fergusson, D. M., Horwood, L.J. & Beautrais, A.L. (2003). Cannabis and educational achievement.
Addiction, 98 (12), 1681–1692.
Hunt, J., Eisenberg, D., & Kilbourne, A. (2010). Consequences of receipt of a psychiatric diagnosis for
completion of college. Psychiatric Services, 61(4), 399–404.
http://ps.psychiatryonline.org/data/Journals/PSS/3907/10ps399.pdf
Lacey, J. H., Kelley-Baker, T., Furr-Holden, D., Voas, R.B., Romano, E., Torres, P., Tippetts, A. S., Ramirez, A.,
Brainard, K., & Berning, A. (2009). 2007 National roadside survey of alcohol and drug use by driver: Drug
results (DOT HS 811-249). Washington, DC: National Highway Traffic Safety Administration.
Large, M., Sharma, S., Compton, M.T., Slade, T., & Nielssen, O. (2011). Cannabis use and earlier onset of
psychosis: A systematic meta-analysis. Arch Gen Psychiatry, 68(6), 555–561. Retrieved March 02, 2013, from
http://archpsyc.jamanetwork.com/article.aspx?articleid=211301
Medina, K.L., Hanson, K.L., Schweinsburg, A.D., Cohen-Zion, M., Nagel, B.J. & Tapert, S.F. (2007).
Neuropsychological functioning in adolescent marijuana users: Subtle deficits detectable after a month of
abstinence. Journal of the International Neuropsychological Society, 13(5), 807–820. Retrieved March 01,
2013, http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2269704
Moore, T. H., Zammit, S., Lingford-Hughes, A., Barnes, T.R., Jones, P.B., Burke, M., & Lewis G. (2007). Cannabis
use and risk of psychotic or affective mental health outcomes: a systematic review. Lancet, 370 (9584),
319–328. Retrieved March 01, 2013, http://www.ncbi.nlm.nih.gov/pubmed/17662880
Muoio, D. (2012). Teenage marijuana use causes mental deficit. The Duke Chronicle. Retrieved March 02,
2013, from http://www.dukechronicle.com/articles/2012/08/30/teenage-marijuana-use-causes-mentaldefici
National Institute on Drug Abuse (NIDA). (2009). Quarterly report monitoring project report 104, December
16, 2008 thru March 15, 2009. Retrieved March 12, 2013, from
http://medicalmarijuana.procon.org/sourcefiles/UMPMC-quarterly-monitoring-report.pdf
Office of Traffic Safety (OTS). (2012). Survey of California drivers shows fourteen percent testing positive for
drugs. Press Release, November 19, 2012. Retrieved March 02, 2013, from
http://www.nbcsandiego.com/news/local/More-Calif-Drivers-Test-Positive-for-Drugs-Than-Alcohol-Survey-180064931.html
SAMHSA, National Survey on Drug Use and Health (NSDUH), Marijuana Use and Perceived Risk of Use
Among Adolescents: 2002-2007. Retrieved March 01, 2013, from
http://www.samhsa.gov/data/nsduh/2k7nsduh/2k7Results.htm
Semple, D. M. et al. (2005). Cannabis as a risk factor for psychosis: Systematic review. J. Psychopharmacol,
19(2), 187–194.
Tashima, H. & Masten, S.V. (2011). An evaluation of factors associated with variation in DUI conviction
rates among California Counties. Prepared for California Department of Motor Vehicles, 2011. Retrieved
March 03, 2013, from http://apps.dmv.ca.gov/about/profile/rd/r_d_report/Section_3/S3-235.pdf
Veen, N. D., et al. (2004). Cannabis use and age at onset of schizophrenia. Am J Psychiatry 161(3), 501–
506.

03.20.13

Funded by the County of San Diego, Health and Human Services Agency

4

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Tom steele 5

  • 1. Marijuana Prevention Initiative Key Data: Marijuana Prevention Points of Consideration The Marijuana Prevention Initiative (MPI) works with partners in each of San Diego County’s six regions to reduce youth marijuana use and increase knowledge of its harmful effects. This document provides selected county, state, and national data regarding youth marijuana use and related health and community impacts. These data points provide relevant marijuana use/perception statistics to help inform marijuana prevention efforts currently underway across San Diego County. San Diego County Data Youth Marijuana Use  Increased Trend The percentage of 9th and 11th graders who reported using marijuana in their lifetime has been increasing since 2007.  In 2011, approximately 26% of 9th graders and 39% of 11th graders reported they had used or tried marijuana sometime in their life (CHKS, 2009-2011).  Increased Trend   Use among 7th graders has not changed substantially over the past 10 years. On average, nearly 10% of 7th graders reported using marijuana sometime in their life, and approximately 5% reported using it in the past 30 days (CHKS, 1999-2011).  Approximately 24% of high school students in the San Diego Unified School District reported that they are currently using marijuana, and over 8% reported that they have used it on school property in the past 30 days (CDC, 2011).  Nearly 11% of high school students in the San Diego Unified School District reported trying marijuana for the first time before they were 13 years-old (CDC, 2011). Approximately 1 in 5 high school juniors reported using marijuana sometime in the past 30 days (CHKS, 2009-2011). The percentage of 9th and 11th graders who reported smoking marijuana in the last 30 days has increased 50% from 2007-2011 (CHKS). Access to Marijuana and Perception of Harm  Approximately 70% of 11th graders in San Diego County reported that marijuana is “very easy” or “fairly easy” to get (CHKS, 2009-2011).  From 2009-2011, the percentage of students who believe that smoking marijuana is very harmful has declined (CHKS).  High school students in San Diego County (9th and 11th graders) perceive occasional marijuana smoking as less harmful than occasional cigarette smoking (CHKS, 2009-2011).  Approximately half of San Diego County 7th, 9th, and 11th graders do not believe that people greatly risk harming themselves when smoking marijuana once or twice a week (CHKS, 2009-2011). 03.20.13 Funded by the County of San Diego, Health and Human Services Agency 1
  • 2. Marijuana Prevention Initiative  Although relatively few young people believe that smoking marijuana is harmful, approximately 80% of San Diego County adult residents believe that smoking marijuana daily or weekly is harmful to one's health (Community Perception Survey, 2011).  Approximately 34% of San Diego County adult residents perceive recreational marijuana use to be a problem in their community (Community Perception Survey, 2011). Treatment Admissions Data  The average potency of marijuana has increased sixfold since 1978, which may contribute to higher rates of youth addiction (NIDA, 2009).  Marijuana is overwhelmingly the drug of choice for adolescents admitted into drug treatment programs, with approximately two-thirds of all adolescent admissions due to marijuana use (County of San Diego Strategic Prevention Plan, July 2011).  The number of adolescents in San Diego County treatment programs for marijuana abuse has doubled between 2004 and 2008, from 738 to 1,579 (CARS, 2010). Implications of Marijuana Use Across California and the U.S. 1 Drugged Driving  Only 11% of people who tested positive for THC (the psychoactive ingredient in marijuana) in the California Roadside Survey believe that driving under the influence of marijuana is harmful (OTS, 2012).  Cases involving driving under the influence of marijuana are more likely to settle, not be charged, or be dismissed than those involving alcohol (Tashima and Hanson, 2011). Driving Under the Combined Influence of Alcohol and Marijuana  California drivers are as likely to test positive for THC as alcohol (OTS, 2012).  Approximately 25% of persons testing positive for THC in the California Roadside Survey also tested positive for alcohol or another drug (OTS, 2012).  Severe marijuana-induced driving impairment is observed with high doses, chronic use and in combination with low doses of alcohol (Couper and Logan, 2004). Implications of Drugged Driving  Driving under the influence of THC is associated with (Couper and Logan, 2004):     03.20.13 Decreased car handling performance Increased reaction times Inability to maintain headway Subjective sleepiness    Motor incoordination Impaired time and distance estimation Increased lateral travel Funded by the County of San Diego, Health and Human Services Agency 2
  • 3. Marijuana Prevention Initiative Academic Achievement 1  Among adolescents, marijuana use is associated with attention and memory problems, slower brain processing, and difficulty with problem-solving – all of which may affect academic performance (Medina et al., 2007).  Heavy marijuana use is associated with higher rates of skipping class, lower GPAs, and failure to complete college (Arria et al., 2013; Hunt et al., 2010).  Adolescents who have smoked marijuana more than 100 times are less likely to enter college or earn a college degree and are more likely to drop out of college than their peers who have not (Fergusson et al., 2003).  Middle and high school students (ages 12-17) with an average grade of “D” or lower reported significantly higher rates of current marijuana use in the past month compared to those with an average grade of “C” or higher (SAMHSA, 2009).  Young adults (ages 18-23) who did not complete high school reported significantly higher rates of current marijuana use than those who completed high school (SAMHSA, 2009). Impact on the Developing Brain1  Smoking marijuana is significantly associated with the onset of psychotic disorders, particularly schizophrenia (Large et al., 2011; Moore et al., 2007; Semple et al., 2005; Veen et al., 2004).  Children and adolescents can become addicted to marijuana more often and more rapidly than adults because their brains are still developing (CSAM, 2012).  The combination of marijuana and alcohol is more addictive in adolescents than in adults (Muoio, 2012). Data Sources Arria, A. M., Wilcox, H. C., Caldeira, K. M., Vincent, K. B., Garnier-Dykstra, L. M., & O’Grady, K. E. (2013). Dispelling the myth of “smart drugs”: Cannabis and alcohol use problems predict nonmedical use of prescription stimulants for studying. Addictive Behaviors, 38(3), 1643–1650. California Society of Addictive Medicine (CSAM). (2012). Impact of marijuana on children and adolescents: Evidence-based information on cannabis/marijuana. Retrieved March 03, 2013, from http://www.csam-asam.org/sites/default/files/impact_of_marijuana_on_children_and_adolescents.pdf Center for Disease Control (CDC). (2011). Youth risk behavior surveillance system (YRBSS). Retrieved March 04, 2013, from http://www.cdc.gov/HealthyYouth/yrbs/index.htm The following data derive from national research studies and may be of great relevance to regional prevention providers in San Diego County. 1 03.20.13 Funded by the County of San Diego, Health and Human Services Agency 3
  • 4. Marijuana Prevention Initiative Center for Applied Research Solutions (CARS). (2010). Indicators of alcohol and other drug risk and consequences for California counties: San Diego County. Retrieved March 05, 2013, from http://www.cacpi.org/docs/County_Data_Files/San_Diego_10.pdf Couper, F.J. & Logan, B. K. (2004). Drugs and Human Performance Fact Sheets. Prepared for the National Highway Traffic Safety Administration. Retrieved March 12, 2013, from: http://www.nhtsa.gov/people/injury/research/job185drugs/technical-page.htm Fergusson, D. M., Horwood, L.J. & Beautrais, A.L. (2003). Cannabis and educational achievement. Addiction, 98 (12), 1681–1692. Hunt, J., Eisenberg, D., & Kilbourne, A. (2010). Consequences of receipt of a psychiatric diagnosis for completion of college. Psychiatric Services, 61(4), 399–404. http://ps.psychiatryonline.org/data/Journals/PSS/3907/10ps399.pdf Lacey, J. H., Kelley-Baker, T., Furr-Holden, D., Voas, R.B., Romano, E., Torres, P., Tippetts, A. S., Ramirez, A., Brainard, K., & Berning, A. (2009). 2007 National roadside survey of alcohol and drug use by driver: Drug results (DOT HS 811-249). Washington, DC: National Highway Traffic Safety Administration. Large, M., Sharma, S., Compton, M.T., Slade, T., & Nielssen, O. (2011). Cannabis use and earlier onset of psychosis: A systematic meta-analysis. Arch Gen Psychiatry, 68(6), 555–561. Retrieved March 02, 2013, from http://archpsyc.jamanetwork.com/article.aspx?articleid=211301 Medina, K.L., Hanson, K.L., Schweinsburg, A.D., Cohen-Zion, M., Nagel, B.J. & Tapert, S.F. (2007). Neuropsychological functioning in adolescent marijuana users: Subtle deficits detectable after a month of abstinence. Journal of the International Neuropsychological Society, 13(5), 807–820. Retrieved March 01, 2013, http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2269704 Moore, T. H., Zammit, S., Lingford-Hughes, A., Barnes, T.R., Jones, P.B., Burke, M., & Lewis G. (2007). Cannabis use and risk of psychotic or affective mental health outcomes: a systematic review. Lancet, 370 (9584), 319–328. Retrieved March 01, 2013, http://www.ncbi.nlm.nih.gov/pubmed/17662880 Muoio, D. (2012). Teenage marijuana use causes mental deficit. The Duke Chronicle. Retrieved March 02, 2013, from http://www.dukechronicle.com/articles/2012/08/30/teenage-marijuana-use-causes-mentaldefici National Institute on Drug Abuse (NIDA). (2009). Quarterly report monitoring project report 104, December 16, 2008 thru March 15, 2009. Retrieved March 12, 2013, from http://medicalmarijuana.procon.org/sourcefiles/UMPMC-quarterly-monitoring-report.pdf Office of Traffic Safety (OTS). (2012). Survey of California drivers shows fourteen percent testing positive for drugs. Press Release, November 19, 2012. Retrieved March 02, 2013, from http://www.nbcsandiego.com/news/local/More-Calif-Drivers-Test-Positive-for-Drugs-Than-Alcohol-Survey-180064931.html SAMHSA, National Survey on Drug Use and Health (NSDUH), Marijuana Use and Perceived Risk of Use Among Adolescents: 2002-2007. Retrieved March 01, 2013, from http://www.samhsa.gov/data/nsduh/2k7nsduh/2k7Results.htm Semple, D. M. et al. (2005). Cannabis as a risk factor for psychosis: Systematic review. J. Psychopharmacol, 19(2), 187–194. Tashima, H. & Masten, S.V. (2011). An evaluation of factors associated with variation in DUI conviction rates among California Counties. Prepared for California Department of Motor Vehicles, 2011. Retrieved March 03, 2013, from http://apps.dmv.ca.gov/about/profile/rd/r_d_report/Section_3/S3-235.pdf Veen, N. D., et al. (2004). Cannabis use and age at onset of schizophrenia. Am J Psychiatry 161(3), 501– 506. 03.20.13 Funded by the County of San Diego, Health and Human Services Agency 4