“Unlike the cigarette habit, occasional pot smoking does not seem to trigger declines in lung function that could lead to breathing problems, a new 20-year study suggests.

“Tobacco takes you down that road toward breathlessness, but low to moderate levels of marijuana don’t,” said study co-author Dr. Stefan Kertesz.”

Read more: http://healthyliving.msn.com/diseases/cancer/occasional-pot-smoking-wont-harm-lungs-study-3