I notice that if fresh water is used everytime with a bong, it doesnt fuck up your lungs so much... plus dirty bongs make yellow smoke... trust me I know. I took a hit of AMAZING weed out of a semi-dirty bong, the smoke came up sooooo thick and yellow, it took all my will power to trust my brother knew what he was doing. And he clamped his fingers over my mouth and nose, saying it was the only hit I was getting, it should count... I let go of this dirty yellow smoke and i was FUCKED UP. I couldnt even move. I couldnt even think. And it was only one hit. I couldnt even function. And my brother was on shrooms with his best friend while I was super high, yet we all had the same facial expression... lol that night was awesome. We caught a scorpion off the ceiling.