it is a groucho marx quote actually
jorge those kids were doing something other than smoking marijuana
also were they eating acid YOU WOULD DEFINITELY NOTICE as it is not something that can be confused with being stoned whatsoever
Its all about the THC man.
skunk, hash, chronic as long as you aren't smoking 1500 pounds of pot in 15 minutes then you're fine.
...
What I was saying before, those kids you mentioned were probably either on something that actually was dangerous and did fuck them up, or they already had psychological problems to begin with. It wasn't the weed and it shouldn't be weed that you're worried about.
No real (or proven) long lasting psychological effects.