Quote Originally Posted by will de beast
also cannabis smoke hits ur lungs at a higher temp and that causes the irration and possibble empecema or however its spelled
Not according to this:

Therapeutic Emphysema Potential

Medical research indicates that light cannabis smoking might be useful for a majority of mild emphysema victims. It would improve the quality of life for millions of sufferers and extend their life spans.

The U.S. government and DEA (since 1976) say the side effect of being â??highâ? is not acceptable, no matter how many years or lives it saves; even though some 90 million Americans have tried marijuana and 25 to 30 million still smoke marijuana relaxationally, or use it responsibly as a form of daily self-medication, without one single death from overdose - ever!

All research into the oxygen blood transfer effects caused by cannabis indicates that the chest (lung) pains, extremity pains, shallowness of breath, and headaches we may experience on heavy smog days are usually alleviated by cannabis smoking throughout the day.

Dr. Donald Tashkin, the U.S. governmentâ??s leading scientist on marijuana pulmonary research, stated that you cannot get or potentiate emphysema with cannabis smoking.
http://www.electricemperor.com/enter/eersrch/page14.htm