i personally think having a full blown salvia experience is the most intense thing with out any other drug needed.. i've tripped on lsd to the point where it was as crazy as salvia, but it still seems more casual to me. like the time i was at that point with lsd, i thought everything was fine.... salvia is like the world ends, being crushed alive by different colors, sent through portals, all sorts of crazy trips i forget who i am, at some points i realize that i have a life in reality with a purpose but can't grasp what that is. it took me a few minutes to remember what my room was and that i had a family when i got back to reality after my last trip. it was pretty casual like the lsd and within under two minutes i was fine, but there was some sense of being confused for a few minutes after that and the confusion during the trip can be crazy although it didn't totally disturb me. i recorded that experience so have a pretty good idea of what i was thinking in the amount of time it happened.
i've traveled through portals and stuff and ended up in dreams on lsd, but salvia has an intense gravity feel that lsd doesn't have for me... i should really try smoking dmt with how much i like to compare drugs. some people say they are similar, but others disagree.