<human>: I'm 30 and have been smoking off and on since about age 13. I was very athletic, believe it or not, until about my second year in college. I didn't really notice any ill effects in lung function until a couple years ago. Now, my cardio sessions are so limited by my lungs. I try to push myself but they just burn so badly. It's embarrassing at this point.

Here's the deal, I only smoke while driving and at work. I don't smoke at all at home or anywhere else. I've been like this for years. Luckily, I only smoke about half a pack each day. The strangest part for me is that I have **zero** cravings at home and on the weekends. I sometimes go 4-5 days without smoking. I just can't seem to let it go. 

It's disgusting, I know it. I've taken control of every other aspect of my life and it's stupid to just let this thing slide under the radar.

I'm headed over to /stopsmoking but I wanted to ask the fine people of /loseit how you've dealt with quitting for good. I feel like there's no way for me to progress in cardio if I don't kick it. Also, I get winded in my weight training sessions when I know I shouldn't. My trainer says I'm all talk and he'll 'believe it when he sees it.' Challenge Accepted! I love proving people wrong!

FYI, I smoked the last in a pack at lunch. I resisted opening the new pack I bought this morning. They're still in my car. Reddit give me strength not to open them on my way home!

Can you summarize the given text in a few sentences?
<bot>: I've been smoking for many years and need to quit for good so that I can progress at the gym and live a healthier lifestyle