Here’s another reason to “keep off the grass.” Researchers in Canada report that marijuana smoke contains significantly higher levels of several toxic compounds — including ammonia and hydrogen cyanide — than tobacco smoke and may therefore pose similar health risks.
David Moir and colleagues note that researchers have conducted extensive studies on the chemical composition of tobacco smoke, which contains a host of toxic substances, including about 50 that can cause cancer. However, there has been relatively little research on the chemical composition of marijuana smoke.
In this new study, researchers compared marijuana smoke to tobacco smoke, using smoking machines to simulate the smoking habits of users.
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