I doubt he's just talking about weed, especially when he says "I'mma need a whole day, at least roll doja"

and "I think I feel in love with a pornstar, and got married in the bathroom". Could be talking about having sex in the bathroom but coke is the sense I got

As far as 808's it's just the whole 80's New York/New Wave coke vibe (Think American Psycho) as well as the arrogance of singing a whole album.