Salvia doesn't effect all people period.
Also, salvia is reverse tolerant, the more frequent and higher amounts you smoke (or ingest to be honest), will result in your tolerance getting lower, hence, the effects stronger.
Sometimes, it takes people 3-4 times of smoking salvia to even get a trip! So if it didn't work at first, get a reputable brand's salvia, and try it a few more times.
"If there are people that get actual 20x, bong it, and don't get fucked up then they should submit their bodies to science for further testing."
5 minutes of googling could've saved this remark.
It's funny to think that an Atypical Psychedelic would be the same for one person as it is the other... psychedelics are hard enough to tell someone who has never done them what a trip will be like, so how can you predict the effects of an Atypical Psychedelic?