If you can puff doobies twice a day and still be motivated enought to lift like an animal, then more power to you, but I seriously suspect that pot decreases your drive and motivation even if you do not realize it. Try taking 2 weeks off the bong and see if your intensity in the gym goes up. This was the case for me and I use to be a huge stoner. 3-4 times a day. I quit cold turkey because of my girlfriend and I started making crazy gains in the weight room.