Actually, I think when Tobacco and Pharmacy companies start to get a piece of the financial incentives in the states where it is legal, you will see their lobbying arm start to influence federal elections on the national level. It is assumed that Marlboro/Camel or whichever tobacco company, could expand their market tremendously with legalized marijuana federal legislation.

I am not an expert (anyone want to chime in?), however it seems right now, the industry does not seem to have any real monopolies and that individual dispensaries (which also have farms?) are making most of the money, rather than any corporations.