This is a very interesting topic. I actually came on here the other day just to look for a form on this particular topic. Since reading it i have spoken with a couple friends of mine and there seems to be a common factor with the coughing of phlegm, and that is the bong.I tend to use the bong about 90% of times and most friends that used the bong to this percentage seemed to be coughing the same thing. I would really like to hear some more info on this if it really is "as healthy as blowing your nose" or whatever. If Birdgirl would drop her opnion that would be greatly apreshiated as i find you to be quite wise and very informitave.