There are many voices speaking in favor of legal pot for so many varied reasons:
It's medicine.
It will relieve prison overcrowding.
It's not as bad as alcohol.
It's not as bad as cigarettes.
It's not as bad as ice.
It's not as bad as opiates.
It's part of the real world, and those opposing it aren't with the current times.
What puzzles me is that the arguments above don't apply to the real reason: Otherwise healthy folks want it legalized so they can get high. 
Kids are already getting high anyway, and more and more cool parents are okay with that. In fact, every school should have at least one family growing operation whose kid is the main vendor for that entrepreneurial niche. The next generation will be accepting of pot as a healthy life choice, and regularly get high as the new normal. 
That about right?
By the way, I work with teens, and that last paragraph isn't made up--it's the current reality.