Stumbled across this site a day or two ago, seems to make a great deal of factual sense, and really puts things into a realistic perspective on health effects. Not a popular topic I know, although this is useful, and surprisingly good, information to hear. Just wanted to pass it along!
http://rodutobaccotruth.blogspot.com/2012/08/pipe-smoking-and-health.html
http://rodutobaccotruth.blogspot.com/2012/08/pipe-smoking-and-health.html