Couple of things to consider for all the anti weed people
People actually want to smoke weed. They do this because it has a pleasant effect. This, despite your indignation, will not change. It’s already illegal, to practically zero effect.
The fact weed is illegal in the U.K. vastly increases the chances of such weed being dangerously contaminated with all sort of bad things eg spice or worse. It also means the potency cannot be controlled. It’s very much like illegal alcohol knocked up in some backstreet, prone to all sorts of impurities.
So, accepting that millions of people will smoke weed regardless, surely the safest and best way forward, is to legalise, decriminalise, regulate and tax the already existing and huge market and make it safer for all, all well as severing the links to criminal activities.
It’s a bit childish to think “ooh why won’t it all just go away!?!”
Try and actually come up with a decent, harm reducing solution, and that doesn’t mean: why can’t the world work why I think it should (stomps feet)… like yer typical mumsnet anti weed hysteric.