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@jecherry_SP @CarolineDivya We do know that it exacerbates existing lung disease like asthma (https://t.co/XEfY8ZOKqg) and can cause respiratory symptoms in people without diagnosed lung disease (https://t.co/1uhD36ISQ3)
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@skrymir42 From PLoS One: "Dual users did not smoke fewer cigarettes than those who smoked only cigarettes. It may be possible that the added nicotine from ecigs did not satisfy dual users’ nicotine levels enough to reduce their usual cigarette intake." ht