A study conducted by Yasmin Hurd at the Mount Sinai School of Medicine on rats who were exposed to marijuana in their “adolesence” shows that they are no more likely to become addicted to heroin then those who were not. (And I always thought that the discrepancy between the 97 million Americans who have tried pot and the 3 million Americans who have tried heroin was enough to shoot down the gateway theory).

Another study conducted by Donald Tashkin at UCLA found no connection between (even heavy) marijuana use and smoking-related cancers. Much of this has to do with the fact that marijuana is hardly ever used in quanities comparable to a dangerous-level of cigarette smoking.

See the full stories on both studies here

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