because the Taxes on Ciggs/Alchohol have built up over the years, they couldnt put the same tax on Weed as what is on Tobacco/Alchohol now. Also...Weed is direct competition with Tobacco, so big tobacco dont want weed legalized, ever.

And yes, WEED is addicting. As for Medicinal Uses, you have people (mostly people that smoke) that say it is good. while others say it is bad.