I’ve never studied or followed the issue much. But I would question those figures.
If pot were legal, and you had to pay taxes to buy it, I think everyone would just put a plant in their backyard.
Presumably, they already collect taxes on rolling papers, LOL.
Yeah, I think a lot of people would initially think about growing their own but in the long run it would be more work than it's worth when you could just pick it up at the liquor store. How many drinkers actually brew their own? Besides pot smokers like drinkers aren't known for their industry and hard work. Further, there would also be heavy penalties for letting plants fall into the hands of minors so... pick up a bag and pay the tax would probably predominate (as it does with drinking).
I got it from here, looks like info about month old.
http://cannabisnews.com/news/24/thread24727.shtml
They will make it illegal to grow except for themselves.