The reason I ask is because of how short-lasting cocaine is. Someone strung out on blow needs to be roping rails like every 30-60 minutes to maintain. It's a constant roller-coaster of up/down, you're sidled up to the mirror pretty much constantly. OTOH, ADHD drugs, being amphetamines, are like a steady 12-24 hour buzz. WAAAAY easier to maintain for someone in Trump's shoes. A couple of fat stripes of addies in the AM will tide one over until the next morning (or maybe pop a pill or five during the day since people are watching you all the time, so huffing could be impractical).
I mean, he seems strung out on stimulants of some kind and his nose sounds fucked up lately so, I understand the gravitation towards coke given those facts. But given his job, and his known past history, I'd suspect he's huffing Adderall (or similar ADHD drug) over cocaine because a doctor would Rx him Adderall, but no doctor would ever Rx the POTUS cocaine, and a POTUS is under watch way too much of the time to ever cop illegal drugs himself.
AND Trump in particular pisses a whole lot of people off, fires them for bullshit reasons, etc. If he was known to be procuring and snorting cocaine, someone he's pissed off would've ratted him out by now.
Of course, I cannot rule out BOTH amphetamines and coke, wherein the amphetamines are the "daily", and the coke is the "occasional party drug, whenever Don Jr. stops by" type of thing. That's also a possibility.
And yeah, I'm pretty sure you're right about him doing blow (maybe with Epstein) in his younger days, to be clear. In that famous pic of him, Melania, GM and JE, Melania looks blasted out of her tree!