Granville Street in Vancouver stank of it when I visited several years ago. But the south side is rather louche. It had no effect on any dining experience I had, though.
Mostly this.
I thought I wouldn't feel like this when I was older (I'm 63) and I do recognise the concept of 'gateways'. However if someone, for example with 'low intelligence' and poor peer support is offered drugs by a mate then.....
Then making them illegal is irrelevant. They will do it...