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Weed, Opiates and Benzos oh my!
In my experiences of doing Adderall (amphetamine), snorting a few at first, then snorting a single pill every once in awhile after that (say a half hour to an hour) will circumvent the comedown completely. It lets you down very slowly, to the point where the euphoria simply wears off after awhile and you're left feeling normal. Maybe I was just lucky though. It's absolutely incredible that way, and I still couldn't get addicted if I tried. The stuff is hard on the body. That and not being able to sleep is an annoyance.
You might not have that opportunity considering cocaine is so damn expensive.