Out of the ones that I've done...
Diphenhydramine: Toxic, scary trips.
DXM: Same as above but not quite as bad.
Propylhexedrine: Too hard on the heart and body in general.
Salvia Divinorum: Terrifying!!!
Coke/Crack: Too addictive.
Opioids: I was addicted to them for 12 years.
Adderall: Addictive, felt toxic and turned me into a porn pervert.
There are a lot that I've never tried and never will, but too many to name (NBOMEs, "Bath Salts", etc.)
The only drugs that I've touched lately are alcohol, benzos & cannabis... and I'm trying desperately to put them behind me as well.
Regards,
Dreamflyer