Well its pretty obvious that if you combine two drugs you will get a different effect than just doing one.

I remember one night when I was high as hell and drunk off my ass. All of a sudden we ran out of cigars and I was the one everyone thought should drive. I did 2 huge lines of "powder" and drove to the store fine, I even ended up getting a buy one get one free box of phillies. Obviously the coke didn't sober me up, if just altered my buzz a bit, and allowed me to think I could drive to the store...I definitely was not sober. Our brains are pretty complicated, even more so when we are doing drugs.

Happy Tokin'