Stopping smoking, it was like a panacea, loads of things I hadn't quite realised were wrong but thought were just me suddenly got better.
I'd got really thin after a major bereavement and suddenly I started putting on weight again properly... and then a little more, which prompted me to eat more healthily to stabilise at a healthy weight without supressing my appetite with cigarettes.
I could soon breathe easily and without coughing, so I started riding my bike a bit longer and further and faster and up bigger hills.
My circulation noticeably improved, so I feel the cold less and in any case now don't have to take my gloves off all the time to smoke so my hands are warmer still.
I've stopped making my arthritis worse.
It gave me confidence in myself to know that I could make changes successfully and take care of myself, and not have the fear of illness hanging over me the way all smokers do. That's helped my mental health quite a lot.
I have colour back in my cheeks, a couple of notches off my anxiety levels, I am better smelling and generally more attractive
.
Then I got pregnant, and was able to be terribly smug about having given up smoking a whole year before, not just because I got pregnant.