The shifts in the composition of the population that the tobacco companies are likely to capitalize on include a continuation of the present increase in the number of people of smoking age from eighteen on up into the fifties for the rest of this decade
Meanwhile, in the U.S., where the nicotine content has increased over time, 12 mg is about the average and it goes as high as about 28 mg
Yet studies, such as this one in Nature , found that the nicotine delivery to the bloodstream from these devices varied, and was still much slower and lower than the concentrations that regular cigarettes give smokers
By comparison, a pack-a-day smoker usually absorbs 20-40mg of nicotine daily
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