I wouldn't because I don't like the way it smells.
My boyfriend does though, and he pointed out something that I didn't know--good quality weed doesn't make people into 'potheads' in the sense that we're used to thinking about them, stupid and dull. If the pot is good, you only need to take a couple hits to get a nice high and your mental faculties remain about the same. If it's old or of bad quality, you have to smoke a great deal more of it to get the same good feeling, and it slows you down and makes you dumb. From what I've observed, the only difference between when he has or hasn't been smoking weed is the way his breath smells, and he only smokes the good stuff. It hasn't hurt his ambition either--he owned his own business for ten years and is currently pursuing his masters.
So, I wouldn't partake for the same reason I don't drink beer--I don't like how it tastes/smells--but I am pro-legalization. I think that the benefits to society if pot were legal far outweigh the downsides.