Peak flow is a really good indicator of the benefits of giving up smoking. Anyone working in the UK dive industry (commercial, DM, Instructor, etc) has to have a specific dive medical every year. I smoked for many years but the medical 15 months after I'd given up showed a 20% increased flow rate from two years before. It was a real incentive to stay smoke free and I've never looked back. Chances are you've also got a big set of lungs so will benefit from both lung capacity and lung efficiency..... A double whammy!
Stick with it fella!
Stick with it fella!