I'm guessing I don't have to convince any one of the truth in the following quote I use on the front page of my website:
The bicycle is the noblest invention of mankind.
~William Saroyan
Getting back on a bicycle, after a long absence is like rediscovering youth. It not only returns vitality to the body, it reinvigorates the mind.
Quiting smoking, of course, eliminates the poisons from your bloodstream that have hobbled physical activity and clear thinking.
Though I've been a lifelong cyclist (I'm 57), I also smoked on and off, until I quit for good 18 years ago. When I quit, I used my training log to track my progress. After 1 week, I gave myself an award in the form of a "no smoking" icon in the margin:
... then at the end of a month, 3 months, six months and finally a year. It was like collecting medals! That helped keep the momentum.
My only long period off the bike occurred during a couple of years I suffered from undiagnosed piriformis syndrome. Luckily, I gained 20lbs. I say luckily, because had I not had that weight to sustain me, I would have wasted away to nothing during treatment for oral cancer in 2003.
I've survived two battles with the crab now, and both times it's my determination to get back on the bike that has pulled me through.
We all make bad choices in life. Of any contraption we canny apes have made, the bicycle alone is a life machine. Put in an ounce of energy and you get back a pound of joy. For those with pounds to spare, the rewards are great!