Don't do illegal or recreational drugs. If it can harm you mentally ang physically, do not do it, whether it is for fun. It is illegal for a reason, do not be a victim. Love yourself.
Recreational drugs seldom cause health or metal problems, unless you make dangerous cocktails out of them, or if you over-consume them. Most of them are harmless (although cheaper products may contain toxins). And this is exactly the reason why I have argued in favor of the legalization of recreational drugs, as it will be easier for the government to monitor its usage.