Best way to stop weed cough is to smoke FIZ and not with water. I had the same problem a while back. One hit would start a cough attack with phlem, I couldn't smoke. Then I found FIZ, after about a week, my lungs cleared up. It's the only way I smoke now...
:wall: Bad idea.
Try FIZ instead. Incredible stuff, i've recently discovered it. I saw it in the cannabis cup 2009 for the first time. Check this clip out, about 3 min into the video.
http://www.youtube.com/watch?v=QD2uFyuXTko
www.buyfiz.com