Is marijuana stronger now than it was 20 years ago?

Is marijuana stronger now than it was 20 years ago?

David G. Ostrow (Medical Marijuana Doctor) gives expert video advice on: What are some potential side effects from using medical marijuana?; Is marijuana a gateway drug?; Does marijuana cause brain damage? and more...

Marijuana today, that is available on the street, is stronger than it was 20 years ago because there's been a movement, particularly overseas where marijuana has been either regulated or de facto decriminalized, there's been a lot of work to breed higher concentrations of THC in the plant itself. But to say that it's 5 or 10 times stronger than it was 20 years ago, I think is an overstatement. I think most people would agree it's gone from like in the low teens to upper teens to perhaps 20 or 30 percent. So you have like a two-fold increase in the concentration of THC. And that can be easily accounted for by just reducing the amount that you smoke or the amount that you put in the cigarette or the pipe et cetera.