In my experience in Europe, the primary roadblock is the controlling moralistic conservatism exhibited by critics like those quoted in the article.
There are also restrictions where you can and can't smoke, like schools, playgrounds or sports fields.
The good news is that vaporization doesn't smell as much (or linger as long) while being nearly equivalent in effects, and edibles don't smell at all. I think users and non-users should be able to coexist peacefully by making a couple of compromises.
Newsflash. Not everyone who smokes „must smoke”. And trust me, in order to smoke responsibly you actually need a ton of self-control.