The tobacco companies and cancer organizations must be having fits seeing all those clouds of weed smoke in public places where tobacco smoke is not allowed.
Smoke is smoke and will still damage your lungs whether legal or illegal.
Simple. You don't make it legal to smoke pot in public spaces.
But isn't the cancer causing parts of tobacco smoke the crap the tobacco companies put in? If in theory, marijuana is legalized, it can be highly regulated to avoid having any carcinogens in the mix? OR am I wrong in that area? Either way, I have no interest in smoking pot, legal wise or not.