I have been using gravity bongs since middle school, I am 18 now. I mean a lot. Regular bongs which I have do not get me as high as the the gravity bongs I pull, and I pull mustard gas ones. To cut it short I need not only look at my 3 liter bottle that was once a clear plastic, now blown black as Mordor to know what I have been putting in my lungs. I can only imagine what it looks like inside me after 5-6 years of that shit. I can only imagine how much my lungs are just caked with resin and debris, I am starting to worry especially since I leave for the Air Force on the 18th of next month. I'm clean now... and I don't even smoke but when I run for more then 5 minutes I feel like there is an enron oil refinery working post-haste inside me. And I got to run a mile-and-half in under 14 minutes for basic. . . Does anyone know a way to cleanse myself or do some inner cleaning short of taking a lung from some poor sap in mexico?