-Vicks inhaler
-Nitrous Oxide(whippets)
-Ketamine/Benzo/Cannabis(for the comedown)
when you're peaking do a bump of ketamine and then 20 minutes later do a nos balloon
I think OP might be asking this question in the first place due to being inexperienced with mdma. I don't think doing a bump of anything would be a good idea for a first timer. I think they should just experience the roll by itself to get the full effects, no distortion of feelings or effects, me thinks.