meth and temazepam. it's more euphoric when you smoke it than other ROAs, but smoking it fucks my lungs up too much, making breathing difficult for the next 2-3 days, among other problems, so I just take a temazepam sublingually immediately after snorting my line, and they both begin producing their main effects more or less at once, and it emphasizes meth's uniquely relaxing and euphoric properties while taking the edge off, keeping you stimulated, but without any side effects worth complaining about. with oral d-meth (Desoxyn), temazepam just makes it turn into a euphoric downer, no stimulation at all.
also meth and weed is underrated, when I smoke very strong indicas when the meth's effects start wearing off, the weed is like 3 times as strong, and smoking a single bong hit of OG Thai sends me into a euphoric psychedelic wonderland and also makes me think in gibberish. It makes you feel very, VERY stupid, which can annoy me, because my brain isn't able to communicate with itself because it can't understand gibberish, so the simple act of thinking becomes an impossible task. If you smoke a smaller amount, the meth's stimulation returns and you feel the same euphoria and psychedelia albeit not as strong, only without the couch-lock and a distinct stimulation. Sorta feels like Ketamine-lite.