There's several of these cannabis coins already and none of them will go anywhere. Why would dispensaries or whatever use a cannabis coin when they can just use Bitcoin? We really don't need a coin for every niche or industry on the planet.
+1
A few of them accept Bitcoin already:
http://www.coindesk.com/washington-dispensary-now-takes-bitcoin-cannabis/
http://www.coindesk.com/colorado-marijuana-dispensary-bitcoin-evade-federal-laws/
It seems to work well for them, and I don't see why they'd take the risk in accepting a coin with such a low trade volume as the cannabis coins.
