1) obviously your tolerance has increased. Smoke until high...
2) if you can't afford to buy more, smoke less often
3) try smoking a different strain preferably some sativa....
4) bongs areN't the most effective by far. Smoke some gravity bongs guarantee youll get FAR FAR FAR more baked
Hey, maybe it is you. But I would try a different strain AGAIN, Give it one last hurra and if you don't get to where you want to be hen stop smoking for a week
Given he smokes 2-3 bongs a sesh; he isnt lightweight enough to notice much after only a week of stopping. Even when i stop for 3+months i lose a tiny bit of tolerance but after the first sesh it's nearly back; however my tolerance is higher than his.