Everyone knows it's a drug. It also has a handful of applications in medicine, but so do a lot of drugs. Doesn't mean it's for everyone. As a recreational drug, the societal and personal harm associated with consuming marijuana is rather low. And nobody with any integrity is acting as though smoking something isn't bad for your lungs.
Weed has already thoroughly permeated society, no use trying to turn back the clock there. We should just stop arresting people for it and stop making it so you have to take unnecessary risks to get it.