I can't help but to wonder if the tobacco lobby is somehow involved. For decades society fought against smoking and has largely won. So, what happened to all of those tobacco crops? I wonder if that industry is behind the legalize movement so they can shift their production to another crop.

Interesting historical fact is that initial tensions over marijuana came about because slaves, and later Mexican labourers were frequent users. White plantation owners (tobacco farmers) took issue with their practices. So, at least in part the banning of marijuana can be partially attributed to racism.