This one is going to be short and sweet. 

Legalize marijuana.  What’s wrong with you if you have a problem with this?  I'm not saying, lets make everyone smoke marijuana.  I'm simply saying, lets make marijuana legal and available for purchase in a Free Market.  What gives you the right to exert such control over the pleasure of others as to withhold marijuana from the Free Market?  If supply and demand were listened to, marijuana would be legal.

What has marijuana ever done to you? 

I could go through the litany of bs trotted out by dirty hippies every time this debate comes up, but I won’t.  There’s nothing wrong with marijuana.  Marijuana will not put you in a state in which you will starve yourself waiting for another fix.  Marijuana is going to make you want to munch.  With marijuana, you’re not going to do much.  Then again, you’re not going to do much so you won’t be stressed out or trying to screw things up much.  Marijuana, generally, doesn't make you want to fight.

If you’re drinking a beer and you're talking bad about marijuana, you've missed the point.
If you've never tried drugs and you’re talking bad about marijuana; then you are ignorant.
If you've tried marijuana and can criticize it without using God's name in vain, I'll listen.