The physical part of smoking pot- the inhaled particulate matter- does mess up your lungs! I had one heck of a toker's cough. I coughed up phlem every morning and my lungs felt bad. I got a vaporizer and it went away after 2 weeks. NO MORE MORNING COUGHING!!! Only when I smoke a pipe at night (I like the "heavier" high of actually smoking at night), do I have any cough at all, now. Rather than having a heated debate whether pot smoking hurts your lungs or not, why not just get a vaporizer and stop coughing? Solves the problem. - Granny:stoned: