I dunno, I've tried the 10x several times (the guy told me that was the maximum strength, so thats either a state law or totally BS). Every time, I used a butane torch and a bong or bubbler. Every time, the smoke has felt acidic in my lungs and been painful to hold in. And every time, I have felt only a short-lived sense of being extremely dizzy, accompanied by horrible flushing and sweating. I don't fuck with salvia anymore.