This ain't your grandpa's weed.
As cannabis becomes legal in more states in countries, it's a claim heard again and again: Today's marijuana is far more potent than it was in the '60s, supposedly. This week, Patrick Kennedy, a former Congressman from Rhode Island, repeated this assertion, tweeting, "The high concentration of THC in these marijuana products is not what people grew up with." THC is the main ingredient in cannabis responsible for the "stoned" or high feeling some people seek.
Though it might sound like one of many other drug scare tactics, there is some truth to the idea. Marijuana, the processed products of cannabis plants, is getting more potent over time. Thanks to specialized breeding techniques, cannabis can be cultivated to produce 30 percent THC or more — although there is a physical limit to how much the plant can actually spit out.
So how did this happen, and how has weed changed over the years? And does this really make it any more dangerous?
The botany of really strong weed
Some of the stronger "weed" out there isn't actually weed, but concentrated versions of it — akin to how pure caffeine compares to coffee, or how cocaine is a concentrated version of the psychoactive drug in the coca leaf. To increase potency, cannabis chemists have, over the years, cooked up many different forms of concentrates. Recent concentrated cannabis innovations often involve industrial processing, and include butane hash oil, rosin, shatter, wax and budder. Some of these sticky confections can contain 90 percent THC or more. In June, The New York Times warned that teens are being poisoned by such products, triggering psychotic episodes and dependency.
Some health experts are extremely concerned about this trend, claiming it increases the risk of psychosis and addiction from ingesting cannabis. A recent review in The Lancet Psychiatry found that "higher potency cannabis is associated with poorer mental health outcomes." But the same researchers noted that these studies are prone to bias and have limitations, such as not measuring exposure levels.
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