Is salvia bad

yes, in theory...

See Bretts Law and research it. This refers to long term use. Additionally, it can cause you to do something that would get you killed if not supervised. This is why salvia users have someone watch over them as they use it. If left unsupervised a person could do something harmful or fetal. As for death caused only by usage alone, I cannot find any evidence to prove that the smoking of salvia has ever been fetal. No doctor has ever reported an overdose or purely salvia related death. Due to the aforementioned, salvia can in theory, kill you; however the reality is that it will not.