12 cigarettes a day As few as 2 per linked to 50% increased risk of heart disease: Study How bad is the air

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[43] A 2015 study evaluated "a variety of factors that can influence nicotine yield and found that increasing power output from 3 to 7.5 W (an approximately 2.5-fold increase), by increasing the voltage from 3.3 to 5.2 V, led to an approximately 4- to 5-fold increase in nicotine yield." [43] A 2015 study, using a model to approximate indoor air workplace exposure, anticipates greatly reduced exposure to nicotine from e-cigarettes than traditional cigarettes

And theyve been successful beyond their wildest dreams

It's possible that they truly didn't know or that they underestimated that possibility, but it's hard for me to accept that