I didn't know that.
I've spent a lot more time in Toronto (where I used to live) than Holland (where I visit), but I've seen a lot more people walking down the street smoking pot here in Canada than I've ever seen in Holland. (Though perhaps things are a bit different in Eindhoven vs. Amsterdam?)
Depends! If you go to the "Bakkerij" (if that still exists) at the "Stratumseind" or some other coffee shops, you'll see the same thing there as well.
But "smoking" on the streets, hardly.