I think it is the other way around. More people without work might slightly increase cannabis usages because people have a lot more time to come in contact with it and they may be bored.
But judging by our closing statement you know about next to nothing about drugs. Drugs like LSD or MDMA(XTC) aren't even addictive, they stop working very rapidly if you keep taking it days on end. After a couple of days it will cause none of the psychoactive effects people consume them for. Probably just some bodily reaction to the chemicals without any enjoyable feelings.
I once witnessed a couple of guys try to get addicted to MDMA(xtc) but after 3 months of persistent efforts they had to admit that what I had been telling them after one week was, despite their previous denials, actually true after all. No rush or high, just some uncomfortable physical side effects.
So why did they keep doing it for 3 months? For no good reasons, it was ridiculous they had to admit in hindsight.
RE: Should Drug Use be Legal?