Bans always, without exception, create illegal markets. Sometimes the positives from a ban may exceed the negatives from a criminal or unregulated marketplace. But mostly they don't.
Britain has through the deliberate actions of the state, egged on by media nannies, fuss buckets and worrywarts, helped to created a multi-billion pound criminal market that is destroying our high streets, increasing violent acquisitive crime, raising risks for children and young people, and increasing social tolerance of crime and antisocial behaviour.
Yet each new social malaise - today it is kids and social media - results in the same response : a ban. Followed by the inevitable, dangerous and profitable black market. And when it doesn't work the state will extend the ban, introduce new controls and make the criminals even richer and more violent.