3rd, pot smoke is very hard on the lungs. in some comparisons between pot and cigarettes, pot has been found to do more damage. of course, you don't smoke as much pot (we hope) as cigarettes, but still..who pays for the lung damage to the person who smokes the pot. chances are, if they are using it medicinally, they are not working.
My biggest problem with this is, yes their are more toxins in the interesting plant cannabis. http://www.webmd.com/cancer/news/20071226/pot-slows-cancer-in-test-tube
Their is another link on web md that shows that Marijuana, actually lowers your chance of getting lung cancer, I will have to post that link later when I find it.
As for my personal experience, its been complicated. I was mentally addicted to it when I was young 13-14, I smoked allot more than I should have. I stopped when I moved, and picked it back up, but I can control it and use it with moderation. I dont smoke more than a few times a month MAYBE, if its a slow month, but its not my main priority to get high. And I allways share this wonderful herb with the ones I love, being my gf mainly whos mother knows, and doesn't have much of a problem with it, though my gf smokes very rarely and only on weekends, shes very responsible with it.
While on the other end of the spectrum, my gf's father. Well hes quite the pot head dead beat stoner. He is the reason pot should be controlled. he smokes every day, never misses a beat, and when he doesn't smoke he is in a horrible mood, the past 20-30 years of his life, he has smoked. and smoked and smoked, sounds like a waste of a life, and he has developed short term memory loss (if not from weed, its from the diabetes).
So my opinion on weed is this; Moderation for recreation.
Just like alcohol, quite the wonderful friend, should be used in moderation, if not get totally plastered on new years eve (lol).
My stance is, with any substance, legal or illegal. It will get used, abused and issued. their is no stopping it, and some place some where some ones going to abuse it way to much, and ruin some ones life, if not their own. Theirs nothing you can do about it.
Man, I just hope you guys understand that this is coming from the voice of the 90's generation. and on a side note, I might have to move to Oregon if I can grow 2-3 plants, thats way more than enough, with a good growing crop you could get up to a pound of weed!