Legalize it and then let the trial lawyers sue the pot industry for the even greater rates of lung cancer that marijuana causes compared to cigarettes.
Marijuana does not have to be smoked to get you high. Vaporizors (if paraphernalia were legal, they too would be more widespread) heat the cannabis to release the THC and other cannabinoids to a temperature well below burning, thereby keeping the carcinogens found in the smoke trapped. Not only is it safer, less cannabis is needed since less of the drug is burned away by fire.
Eating cannabis (in the form of Hash) is ten times more potent and lasts at least twice as long, also without releasing carcinogens found only when cannabis is burned.
You know you can drink a beer and not get drunk. I have yet to meet anyone who smokes MJ for anything but the effect sought.
They are not the same thing.