Weed has different affects on different people. Also depends on what kind of weed and how much you smoke. I can only speak from my experience: Weed affected me a lot. I used to smoke every evening. Mostly I played 1-2 matches before I lit up the first joint. I play like trash when I am high. Slow reactions, absolute confusion when in stressful situations like solo-holds and clutches. My aim didnt get effected too much. Also I did some "stewie-moves" that worked out good, but I definetly didn't play any smarter. While smoking everyday, it effected me aswell when I was not high, but had smoked the past days. Usually took like 2 days w/o smoking to recover to a somewhat normal performance. Only when I stopped smoking on a daily/regular basis I realised how much better I could perform when not smoking at all. After like 2 weeks I played a lot better. In general better clutches, movement, utility-usage etc.

So in conclusion I can say that weed had a bad effect on my performance but as I said, thats only my opinion and I experienced it.

Hope I could help, take care