These threads always get closed. It's still a good question, though. No one should be thinking of adding it in to improve their game. It only helps if you're used to it, and not having it would become irritating. Whenever you're irritated your play will not be as good.
It doesn't help if you're used to it.
It doesn't help if you're not used to it.
It doesn't help.
It's basically just a carcinogenic stupefier which makes your teeth fall out.
I'm thinking that chess players are people too, and some of them have experience with this topic.
That said, I can't imagine anything wrong with combining two wonderful things.
Marijuana is a highly addictive drug which makes its users bored, angry, depressed, boring, apathetic, boring, lethargic, stupid, useless, boring, slow, boring, and boring. One of my best friends from school ended up becoming a consultant psychiatrist, and the locked ward he was in charge of was full of marijuana casualties.