The moment you stop smoking, your lungs begin to repair themselves. in fact, just 12 hours after you quit, the amount of carbon monoxide in your blood drops to a healthy level. Otherwise healthy men who have smoked the equivalent of one joint daily for seven years have a lung capacity that is 1. 6 percent higher than that of otherwise healthy non-marijuana-smoking men. Smoker's vs. normal healthy lungs. to really comprehend the effect of tobacco smoke on the lungs we need to take a look at both the anatomy—how the appearance of the lungs changes, and the physiology—how the function of a smoker's lungs differ from those of healthy lungs. . The Difference Between Healthy Lungs And Smokers Lungs Marijuana and lung health american lung association. See more videos for a healthy lung vs smokers lung. Smoker'slungvs. healthylung: even grosser than you thought. this video will stop you dead in your tracks. by jenna birc h. you probably already know that hardcore, longtime ...