off the top of my head...

Add a sprinkling of dried mint leaf to your tobacco, especially if you roll your own. Or, you could either briefly soak your smoke in strong mint tea, maybe make the tea and spray it on the tobacco then let it dry for a day or two on a screen.

Those would be organic means of accomplishing the flavor and probably less harmful than the crap the corporations spray on tobacco.

I have made my own natural medicines and sundries for decades so I'm not just pulling your leg. I would caution you to experiment with different mints, there are many, and be careful about how strong you make it as you could do serious damage without taking care to learn about what you are using. I am seriously allergic to all mint types so I can't offer personal experience, and I don't smoke tobacco either.