You mean besides breaking it down and selling it? If your state allows medical marijuana it worth looking into cannabis cola if you have the capital for a dispensary and bottling site.
http://www.drinkcannacola.com/. If this was something I was gonna do I'd open a bakery with all products laced with THC, cupcakes, ice cream, bread, etc.
I'm concerned about the supply issue as Painter is: if it's legal anyone with few grand will start selling it, Marketing and differentiation will be key. A business is a business, there's no special plan for a weed shop.
Imo, it should stay illegal. The laws are asinine but I view crime as an equalizer between men. Fuck Paris Hilton can't sing but she had CD on a major label. How? $$$$
Start-up capital/small business loans aren't easy to come-by , you can flip trees for a year, build a team and parlay that into legit business. A guy around my way did that in the '90's, last I heard he quit the drug game 2 yrs ago cuz he has a bar, laundromat, and several rental properties overseas.