Marijuana can cause a lot of problems.
Personally, it usually makes me fall asleep and miss the rest of the party.
But people usually take pictures of me (or draw pictures on me, or both) so I can learn how fun it was anyway.
So there's no need to do cocaine or uppers of any kind to stay awake, not in this modern age of technology.
Gateway drug problem solved!
(See also Begateway.)