I am diametrically opposed to this for several reasons. First, for several years we have been hearing what cigarette companies have been doing to their product, the addition of nearly lethal chemicals to tobacco has cost millions of people their very livelihood. I am not so jaded to believe that the tobacco companies once given the green light to commence growing operations wouldn't conduct business any differently with marijuana than they have with tobacco.
This is actually one of the better arguments for legalization. Big tobacco has a stranglehold on the legal smokes market because growing, drying, and processing tobacco is a real bitch. Most people can't do it. Growing your own dope is a piece of cake, and you know exactly what's in it. I agree with whoever wrote the above snippet that PM and RJR will put all kinds of horrible stuff in any pot they sell, but I suspect the majority of people will smoke independently grown dope long before buying commercial.
Personally, I enjoy smoking (in general). I've finally gotten to the point where I just don't like smoking cigarettes any more at all. I'm not naive enough to think that it'll be a huge market, but I suspect there are others like me who would enjoy smoking some high-quality but non-psychoactive marijuana from time to time. It's smoother, a helluva lot tastier, and I don't always want to get baked. I'd like to see this avenue explored.
However, as we saw with that bullshit ban of clove cigarettes, it's much more likely that our government will rally to protect big tobacco than allow anything that might be more enjoyable to be sold.