Marijuana should be freely obtainable from licensed merchants. It would probably be taxed at a high rate, and there should be laws against operating machinery while under its influence. There would also probably be some licensing mechanism to guarantee its purity.

If possible, all individuals currently in prison for marijuana-related offenses should immediately be released.

The resulting savings in law enforcement resources and prison space, and the accompanying increase in tax revenue would be tremendous. In addition, patients in extreme pain would be able to manage that pain at minimal expense using plants which are easy to cultivate, rather than paying exorbitant amounts to pharmaceuticals.

Biologists would be free to research the effects of THC on the human body, which they are currently forbidden from doing. There have been some indications that THC my have tumor-destroying properties -- not nearly strong enough that I should immediately recommend cancer patients start lighting up as often as possible, but certainly strong enough that if not for the legal issues, follow-up studies would have been performed by now.

That is what I, at least, mean by "marijuana legalization". From my epistemic vantage-point it is an easy win and it is astounding that our government continues to get it so blatantly wrong.