not sure of the current situation but think things have changed a little, it was originally tolerated, people turned a blind eye - when you see episode of Poirot around opium smoking, it is something that someone else did and they were left to get on with it? Slight bemusement.
then panic in society as dope was associated with rebellion or 'being different' - it might change things. People quite happy to purchase art or music created with the influence but people banged up for very little. I knew someone said he took the rap for a brothers pipe years ago, he had brief spell inside and it made his life very difficult for a bit.
Then it got to stage that a small amount of cannabis was just confiscated from what I've heard - didn't press charges, now we get the police themselves wanting to decriminalise stuff. Muddled change it seems to me.
In the mean time they prescribe opiates, codeine, antidepressants, stuff that is addictive. It depends who is profiting from sale of drugs I guess. Booze creates more sorrow than a lot of things I think.