If other states follow what Colorado and Washington have done, then government will not get involved, or will have little influence. Instead of corporations getting involved in marijuana itself, they'll use the market for smoking devices, grinders, papers, etc. to make their money. Also count in edibles and stuff. Plus, the two states currently allow you to grow a set amount of plants for your own production, which you can't do with tobacco, and dispensaries have to grow something like 70% of their own marijuana. New time period, new laws, new product, new generation of business.