That's in the current market where you can buy it legally. A ban changes the landscape completely. Prices would go through the roof for starters.
Why would you bother risking a record when vapes exist and there's better illegal stuff like bud or powder?
I think this will be an indication of how shit and pointless tobacco smoking is.
I don't see there being a black market, what would be the point compared to existing drug markets :shrug: