There are really just two primary types of coke users, the type who do coke and then go out and get themselves into shenanigans, and the type who hole up in a room and do line after line while doing degen/retard shit.
Coke itself doesn't "cause" dopamine euphoria the way a lot of people think it does, it really just makes dopaminergic activities you already do feel a lot more intense. Ralph's source of dopamine is hollerin and grunting, acting like a rage pig and occasionally smackin a bish, so he falls into the second class of coke user. He's perfectly content to just do the same shit he already does while railing line after line. The fact that he's using metal straws is a clear sign he's graduated from casual user and is now regularly using, and Ralph has very little self control so there's good odds his cocaine arc ends with him slumped over a keyboard.