Has anybody read this study?
Nicotine Levels in Electronic Cigarettes
Nicotine Levels in Electronic Cigarettes
Results: The total level of nicotine in vapor generated by 20 series of 15 puffs varied from 0.5 to 15.4 mg. Most of the analyzed ECs effectively delivered nicotine during the first 150180 puffs. On an average, 50%60% of nicotine from a cartridge was vaporized.