Hmmm. Tough one.
I can't see, firstly, how the youngsters can avoid developing a drug habit if their mother promotes it to them in such a way.
It has to be admitted that there would be many cases where youngsters got into the prostitution-drugs cycle or taking drugs-dealing to feed habit cycle that could have been avoided had someone kept them out of the dealers' way like this. It's just a fact: they sometimes get drawn into this 'world'.
Cannabis: the risk of psychosis/schizophrenia are 'doubled'. Actually, the risk of psychosis/schizophrenia aren't THAT high to begin with: schiz is 1/100 lifetime risk. So that's a LOT of people taking cannabis without this happening to them. However there are a lot of other side effects for many: apathy, paranoia, lung cancer, etc.
We're fighting an uphill battle now though, after the govt upgrade/downgrade fiasco.