Pot raises your metabolic rate which is good but hinders your cardiovascular system from the smoke. I love smokin pot before I workout and then putting some heavy tunes on. However if you lift a lot of weights you'll notice a decrease in strength while you're on the pot. This has to do with your muscles not recieving the correct amount of oxygen to power the tissue. The same goes for doing cardio. The tightened vessels from smoking will prohibit your body from transporting o2. I would say find what you like to do. I've worked at a gym for 3 years as a personal trainer and the one thing that really matters is that you go and give it 100%. So if you want to smoke pot or do acid or blow pain killers...wat ever just get to the gym lift 3-5 days a week with 6-7 days of cardio get plenty of protein, carbs, and fats because all are necessary (stay away from saturated fats). The biggest thing to remember is the more muscle you have the higher your resting metabolic rate is which will in turn have your body using more calories at rest. Dont eat before bed, leave a 4 hour gap between bed and your last meal...6 weeks you'll be lookin good. just focus and don't be a bitch. lol. Good Luck!