I started smoking on the day of my 16th birthday, which, at the time and place, was the legal smoking age. It was irresistible for a high school kid with a job. By the end of that first pack I was completely hooked and smoking would be a permanent part of daily life.<p>I only smoked for about a year before deciding to quit. Unfortunately, I took me 12 years to finish quitting.<p>During that period of my physical prime (ages 18 to 26), I couldn't climb a flight of stairs or ride a bike without getting completely winded. Any sort of physical exertion would result in gasping, coughing up phlegm, and seeing stars. A pick-up game of basketball or street hockey was out of the question.<p>I finally kicked it at age 30, 14 years after I had started. Although it took a while, by age 35 I could physically do things my 20-year-old self could only dream of. Like riding a bike up a hill, or exerting oneself at the gym.<p>I'm now in my mid-40s, and while the rest of body is now deteriorating at an alarming rate, my lungs are quite literally the only part of my body I never think about. I'm physically stronger and healthier in my mid-40s than I was at age 20.<p>So if you smoke, quit. Your lungs will recover.