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Alcohol and nicotine, the drugs that are claimed to be safer, are actually considered by the scientific community to be hard drugs in comparison to cannabis. Furthermore, scaling up from animal studies, an average human would need to ingest over a kilogram of cannabis to die of an overdose.

There are studies that show no actual increased risk of cancer from smoking marijuana, even when duration of use is expanded over several years. In fact, some studies indicate THC to have anticancer properties, with studies showing tumor reduction in mice.

The idea of brain damage from cannabis may have had its origins in, or was at least popularized by, the results of a few studies on monkeys and rodents in the 1970s. However, the rodent studies involved 200 times the psychoactive dose of THC, and the monkey studies involved insufficient sample sizes and controls, and misidentification of "damage." In fact, the most (in)famous study finding evidence of brain damage involved forcing the monkeys to inhale huge amounts of cannabis smoke over several minutes straight, every day, causing potentially confounding oxygen deprivation and carbon monoxide poisoning. More recent studies, however, failed to show any brain damage from cannabis in monkeys when better experimental techniques were utilized.

Many school programs today teach that cannabis users are at a much higher risk of getting lung cancer or other diseases than tobacco cigarette smokers. While unburned cannabis or THC is not a known carcinogen, it is technically true that cannabis smoke, like any smoke, contains carcinogens. However, the largest study of its kind by the University of California - Los Angeles found that people who smoke marijuana are no more likely to develop lung cancer or head and neck cancers than non-smokers. In fact, some studies have shown that marijuana may actually reduce the risk of some cancers by as much as 61%.

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14y ago

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