fda-ctp cigarette tobacco coresta ecigarette tayyarah cigar ngp ends center for tobacco products pmta nicotine ngtp evapour tsna hphc tsrc tar smoke bap carbonyl e-vapour e-cigarette next generation rrp product variability product characterization coresta tsrc fda-ctp ends cig lorillard fda cresol resorcinol hydroquinone catechol phenol iso flavor menthol substantial equivalence statistics method batch to batch variability combustible cigarette regulation cigar science premium cigar mass market cigar mmc prep imperial itgbrands formaldehyde 3r4f cvar tayyarah tobacco equivalence skycig blu fontem carbon monoxide aromatic amine volatile organic arsenic volatile http://dx.doi.org/10.1016/j.yrtph.2014.10.010
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