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Highly effective weed: What we know about the health effects: Shots



Studies have shown that levels of THC, the key psychoactive compound in the pot, have risen dramatically in the US from 1995 to 2017.

David McNew / Getty Images


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David McNew / Getty Images

Studies have shown that levels of THC, the key psychoactive compound in the pot, have risen dramatically in the US from 1995 to 2017.

David McNew / Getty Images

The more states that legalize marijuana, the more people in the US buy and use weeds – and the type of weed they can buy has become much stronger.

This concerns scientists investigating marijuana and its effects on the body, as well as emergency physicians claiming to bring more and more patients with weed problems to the emergency room.

Around 26 million Americans, ages 12+, said in 2017, according to the National Survey, that currently marijuana users are on drug use and health. It is not clear how many users have had serious health problems due to weeds, and there are a lot of unknowns about the potential risks. But scientists are starting to learn more about some of them.

The effectiveness of weeds depends on the amount of delta-9-tetrahydrocannabinol or THC, the main compound responsible for the psychoactive effects of the drug. A study of pot products confiscated by the US Drug Enforcement Administration showed that the effectiveness increased from about 4% THC in 1995 to about 12% in 2014. By 2017, another study found that the efficacy of illicit drug samples increased to 17.1% THC.

"That's an increase of more than 300% from 1995 to about 2017," says Staci Gruber, director of the Marijuana Investigations for Neuroscientific Discovery Program (MIND) at McLean Hospital in Belmont, Massachusetts, USA significant increase.

And some products with concentrated cannabis forms such as hashish and hash oil may contain up to 80% to 90% THC, she adds.

"I think most people are aware of the phenomenon that" this is not the case Your grandfather's weed is, "says Gruber." I hear that all the time. "