I think the purpose of those laws is typically to protect the workers. So like in a bar the bartender might not smoke but breathing in 2nd hand smoke all day isn't healthy. One might say the workers would go somewhere else if they cared enough about it, which is a fine point. However, you could use the same argument to justify any unsafe work condition which creates a slippery slope. What is ridiculous is that some states are passing laws banning things like smoking in your own car, which seems like a big invasion of privacy. The difference between big tobacco and big marijuana is that smoking causes lung cancer. There haven't been studies on the long term effect of marijuana smoking (that I know of) and the best people can do is intuitively guess that all smoke is bad and therefore causes lung cancer. Even !@#$%^&*uming smoking marijuana causes lung cancer, there's other, non-cancerous ways to consume it. Firstly one can cook it into brownies (google space cakes), and secondly one can also vaporize pot. In the latter, the plant is heated until the THC (the fun stuff) evaporates into the air and you breath that in, without burning anything. Tobacco, on the other hand causes cancer in pretty much all forms. In terms of ease of growth, I've seen pictures of people growing one strain (low ryder) in dixie cups! Try doing that with tobacco.