The risk that marijuana use poses to adolescents today is far greater than it was 20 or 30 years ago, because the marijuana grown now is much more potent. In the early 1990s, the average THC content of confiscated marijuana was roughly 3.7 percent. By contrast, a recent analysis of marijuana for sale in Colorado’s authorized dispensaries showed an average THC content of 18.7 percent.
Source: Opinion | Marijuana Damages Young Brains – The New York Times
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