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The study, accepted for publication in the journal Addiction, also found that the use e-cigarettes has largely been confined to smokers, with minimal use by non-smokers

Because of the large number of people in the study--more than 25,000-- researchers could see differences in lung function among light smokers (less than 5 cigarettes per day) and heavy smokers (more than 30 per day) that other studies have been unable to detect

Responsibility for any use rests exclusively with the user Description Pack, smoking cigarette

The criteria for a current smoker is someone who has smoked 100 or more cigarettes over the course of their life, and currently smokes either daily or some days

How many cigarettes a day is considered heavy smoking