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Studies have shown that the levels of THC, the main psychoactive compound in pot, rose dramatically in the U.S. from 1995 to 2017. David McNew/Getty Images hide caption

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David McNew/Getty Images

Highly Potent Weed Has Swept The Market, Raising Concerns About Health Risks

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A young man with a joint in his left hand jokes with the photographer as he passes a sign prohibiting the use of marijuana and alcohol, in a designated area in Amsterdam on Wednesday. The city's mayor says students would be formally banned from smoking marijuana at school as of Jan. 1, 2013. Peter Dejong/AP hide caption

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Peter Dejong/AP