What drugs are affected by chs

I heard someone say ketamine triggered there chs so im interested if any other drugs do the same. And if stuff like ketamine triggers chs does that mean you have to avoid it permanently? Ive heard two people say this the first guy said he tried ketamine three months after quitting weed and got a episode triggered. The other guy said he was 8 months into quitting and ket still triggerd it. How is that possible?