Regular dosing levels. A recreational pot user may smoke a couple joints a week vs a pack a day of cigarettes. or see this http://healthland.time.com/2012/01/

Regular dosing levels. A recreational pot user may smoke a couple joints a week vs a pack a day of cigarettes. or see this http://healthland.time.com/2012/01/10/study-smoking-marijuana-not-linked-with-lung-damage/ http://healthland.time.com/2012/01/10/study-smoking-marijuan... Many people vape, ie extract thc with heat, not fire. I would guess this also reduces carcinogens.