[tevake]

How about trimming down the work load at your shop, and work only cars that you enjoy working on. Pick your favorite clients and work by appointment only. Take any signs down on the outside of the shop. So you don't have to deal with walk ins or jobs that wear on you.

I know this was brought up in an earlier thread, but seems to answer lots of your concerns. Have you thought along these lines?

Congrats on your moving on from the smoking!

Cheers Richard