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social effects of tobacco use and the environment 26 Health Effects of Smoking
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The effects of marijuana may wear off in a few hours, but due to ongoing drug use, THC and its metabolites can remain in your body for days or even weeks

BMJ 1889;ii: 253 [Google Scholar] 31.Anonymous

Charles is a young guy, probably in his 30s
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(7) medical staff at clinics were not blinded to group allocation (single blinded study)

When hunter-gatherers resided there more than 12,000 years ago, the area would have been filled with low-lying marshlands
