Times change. Research it. It used to be that one joint was worse than "a thousand cigarettes"... Now there's multiple documented research and test groups that show literally ZERO ill effect from marijuana use. Especially if ingested orally through mild edibles.
It has helped multiple members of my family battle cancer when no other remedy would work to make them comfortable through hardcore chemo (I.e. nuking your body). Creates appetite, allows for sleep, etc.
Alcohol is much worse. Do you ever here about potheads beating their wife? Or driving 100 on the highway and killing a family of four?
Look at the statics vs. alcohol use. Hospitalization, mental faculties, family unit damage, etc.
Alcohol is MUCH worse in every category. Your liver won't rot out of your gut from smoking pot. Hell, you won't even get lung cancer if you're intelligent and savvy in your consumption methods.
It's benefits when used correctly far outweigh any (almost nonexistent) consequences. (impaired reaction time? Maybe? If you're dumb already I guess).
I could go on for days... But I won't. It's an argument as old as time.
And of course, evol, to each there own. Far be it from me to preach!
And in my state, it's decriminalized as well as legal for medical use.
Funny, I rarely ever drink but will sneak a J in every now and again and head down into the shop. Never go anywhere else really, have to treat it with the same respect you would with alcohol. Can't at the moment as I'm job hunting, but we'll see how things shake out. Never touched anything else except in my early 20's tried acid and fell down an 8-hour rabbit hole. Never, ever, ever again. I like having control of my mind. 
