I think deep breaths of oxygen are the best reward and always available.
Cool glasses of water.
I also turned my smokey thoughts around and found something beautiful to look at.
It could be a leaf, a cloud, a color, I studied the beauty.
or a listen to a piece of music, Sit down and listen intently, yay headphones.
Read a passage in a favorite book, a favorite poem.
I ate a lot of satsumas as a treat. Take a luxurious nap in clean sheets.
A pampering bath or a long, long shower. Give yourself a manicure/pedicure.
All these things are mostly free and sugar free too.
Other rewards came after one week/ one month etc.
I bought a tree, can't remember when....6 months.
Had a stash of ducats saved up.
I put the cost of a pack in a big mason jar every day.
That was inspiring and paid for little and big rewards.