by Rawberry van Lightening Question by Bettie: When will I start noticing the benefits of quitting cigarettes? I quit smoking 3 weeks ago! I am training to leave for the Marine Corps, which is part of the reason I made the decision. I am wondering when will my lungs start to benefit. I had a difficult time with my run because my lungs were hurting so badly. How long does it take to notice the benefits of quitting, and will quitting help me run better? Best answer: Read more... ...