Despite its new-found legality at the state level, the buds you buy in medical marijuana dispensaries aren't that different than the dime bags you used to score on the street corner—they share the same wild swings in potency, chemical content, and fungal and pesticide contamination. That's very not good.
You have tons of vodka lying around. Maybe your friends left it. Maybe it was on sale. Maybe you bought it because it's cheap and you heard you could make it into whatever booze you want. What?