Yes, that is the worst side effect of tobacco ban. With current addiction levels, a total ban may cause an explosion of crime organization like alcohol prohibition did.
But the difference between tobacco and any other drug is that tobacco does not have any benefit. While helping people addicted to stop smoking may be difficult, why would anyone start smoking tobacco?
I can think of a few reasons why people start. They aren't worth the horrible health problems but there really is something appealing about smoking ( to me at least). I would consider vaping nicotine or smoking a cigar and restrict myself to once every month or so since the health risks of infrequent smoking aren't large.