I love pot, I just wish I could smoke it...I know I can still smoke it, but that is out of the question for me. I know others under my doctors care who swear by smoking pot also. In general, it's ALWAYS a bad idea to be inhaling smoke burnt from anything, but we all have our crutches in life. Most people all need atleast one vice, mine happens to be beers on weekends. If pot doesn't drag down your PFT's, and your PFT's are 158%, well...Kind of stupid for me to criticize you for smoking it. My PFT's are 99% (last check) and I don't smoke it, so whatever.
I personally LOVE the smell of pot though, so whenever anyone around is me tokin up, I get close and enjoy the aroma. Cigarette smoke is disgusting and makes my lungs bleed, pot smoke smells great and has never messed with my lungs.