Its kind of hard to be clean-living when you're baked out of your mind on a brain-killing drug.
Like alcohol?
You need better arguments than that you don't like the people that you perceive are the users of marijuana.
Friend, people have been smoking and ingesting marijuana in all sorts of forms for thousands of years. Even some of our illustrious Framers smoked it.
I quit fogging my brain with that stuff forty years ago, but I'm not so naive as to believe that my personal preference makes me better than someone who still partakes.
I also don't drink on work days or evenings, but that's a personal choice to keep my head clear on those days. I don't fault anyone who has a few beers after work, and I couldn't care less if someone wants to smoke a joint in the privacy of their own home, either. If they show up on one of my jobs hungover from either one, they're fired.