I didn't change the screen in my pipe for more months. Instead of cleaning it I usually just placed another screen on it. The third screen I put was about a month ago. Yesterday I noticed it was really hard to inhale through it because it was clogged up by the screens. I took the screen out and placed 1 good one, and it was good again. The 3 screens I took out were all covered in black, I decided to try and see if I cans moke it, I packed 2 of the screens in the pipe and lit it. I was amazed how fast it started burning, alot of smoke came out of it too. I had about 10 hits out of its and I'm pretty stoned right now. The only bad thing is the taste, tasted kinda metallic and I was wondering why. Is it because the screen is being burnt and inhaled too? or is it because the black stuff is so attached to the screen that it taste like it?