I started smoking when i was 14 years old...... and i smoked for 15 years. Then I decided I wanted to get in shape so i started taking Chantix. This little pill I took every day for a few months really helped me to quit smoking! I have been quit for over 3 years now! I tried the patch, vaping and everything else and Chantix was the only thing that really worked. Anyway the crazy part about this story is ......now that I quit smoking..... I have had breathing troubles. I have been hospitalized several times because of low oxygen. I had double pneumonia and was hospitalized, and ever since then, I have had a lot of trouble with my lungs! But when I smoked cigarettes, I never had any serious breathing troubles, just your regular shortness of breath that most smokers have. The doctors say its asthma, but I think they are just unsure what the cause of my problems actually is.