Does marijuana hurt or help your brain? Scientists rush to study the drugs impact

Miles O’Brien:

And the pot is much stronger than it was a generation ago, when it contained, on average, about 5 percent THC, the psychoactive main ingredient in marijuana.

Today, the plants themselves have been bred to be much more potent, 12 percent THC on average. Strains over 20 percent are widely available.

But that is still not enough for Dario and his friends. They frequently use highly concentrated cannabis products known as shatter, oil and wax with average THC levels of more than 50 percent, up to 80 percent and even higher.

They prefer the concentrates in part because they get more buzz for their buck.

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