I know the effects of legal highs bud thats why ive said in this thread about 3 times to stay away from them. That Mkat, NRG etc. is all properly addictive stuff. I know thats not legal anymore but the ones that are, China white, Charlie sheen etc. are probably just as bad. As for Salvia, thats a one off experience for most people, anyone who abuses that is no doubt gonna end up in a horrible state.