Marijuana, like alcohol, is known as a central nervous depressant, but a new, large scale study shows it’s worse than that: smoke dope in your teenage years, and you risk depression in adulthood.
My personal attitude has always been that any psychoactive substance is bad for you, chocolate excepted. That is after all my favourite vegetable. (I am a dry chocaholic: I don’t buy it, but gladly accept it as presents. Then I use it for medicinal purposes only, like staying awake when I must.)
The worst drug people can buy is alcohol. Various opiates and amphetamine-derived drugs are pretty bad. Marijuana is not as harmful as any of these, but still causes damage.
If you learn to think right, you won’t need any of them.