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No studies to date have shown evidence of any harmful effects of marijuana itself. The only negative cognitive effects that have been found attributed to marijuana are impaired memory and learning skills in long-time heavy users, however those effects appeared in very few users. These findings are based on various studies performed in the past with study lengths ranging from months to over a decade.

However, according to some researchers, soon is when we should start seeing negative effects in older marijuana users if there are any as it may take many decades for effects to precipitate.

Aside from cognitive effects, it is very possible that smoking marijuana can cause lung problems just as tobacco can due to some of the same carcinogens being present in both. However, this is easily ameliorated by vaporizing (The possible negative effects of which have not yet been studied) or eating it prepared in foods.

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12y ago

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