If you’ve ever smoked up with someone who lived through the 1960s, you may have heard them remark that marijuana is much stronger than it used to be.
But is that actually true, or just a hippie myth? Here’s the straight dope.
How we measure marijuana strength
Because it’s too difficult to ask Willie Nelson, we’re forced to measure weed’s potency the only way we really can: by examining its concentration of THC, or tetrahydrocannabinol, the psychoactive chemical that gets us high.
Source: 420 Intel – United States