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Some research has shown that cells exposed to e-cigarette vapor showed similar genetic changes as cells exposed to conventional cigarette smoke raising concerns that e-cigarettes could potentially lead to lung cancer

The more that time passes, the clearer it will be that for many users e-cigs are a permanent alternative source of nicotine, rather than a cessation aid

Edible forms of marijuana, such as brownies or cookies, might not have the same pronounced smell, but a keen nose might still detect a green or herbal scent

Any link between marijuana smokingand lung cancer isn't clear now, but researchers have a chance to move beyond some of the problems that have made studies unclear in the past