The researcher was equating 20 puffs to one cigarette, but the article doesn't say how that figure got selected. For a pack-a-day smoker, that would be 400 puff

The researcher was equating 20 puffs to one cigarette, but the article doesn't say how that figure got selected. For a pack-a-day smoker, that would be 400 puffs a day. In a 10 hour period, 40 puffs each hour. I don't smoke or use e-cigs. For someone who does, how many puffs are you taking in a typical day? Do you think this is a good correlation? Do you typically, when puffing your e-cig, take 20 puffs in a few minutes as you would a cigarette? When you did smoke cigarettes (assuming you once did), does the number of puffs you take on the e-cig correspond to how many cigarettes you would smoke? Maybe people take fewer puffs to replace the same amount of cigarettes, which would undercut some of the conclusions reached.