Faith-Hope-Love, how could you possibly know what your lungs look like, and assume that an hour of excercise "virtually makes your lungs resin free"? Or that coughing up black shit means your lungs are healthy and you're just cleaning them. You're right not all smoke is created equal but smoke is still smoke and you're lungs are not designed to inhale it. Thats why it irritates your lungs and makes you cough. If you think you can ride a bike and your lungs are like brand new again keep filling up with smoke i guess. But im not living in denial.