Years ago my DMIL gave me a beautiful leather jacket. She smoke heavily...eeeeuuuuuwwwwww..... I'm very highly sensitive to smoke. I took the coat, put it in a large garbage bag and dumped an entire large box of baking soda in along with the jacket. I sealed it up, every few days I would go in and shake that bag for all it was worth. I left the coat in there for a month, changed the baking soda halfway through! Seriously, I did!! At the end of the month, I dumped it out, shook out the coat, (which took forever) and to my complete an utter amazement there was not one tiny whiff of smoke left in the coat! If anyone would have detected smoke smells it would be me!! To this day I am still amazed!
It took quite some time, but it was well worth it!! HTH
Also, have you thought about calling the non emergency number of your fire dept and asking their advice on what could possibly remove smoke smell?? Just a thought.
Wish you the best!