How to ask my mom to not smoke in the car with me?

My mom is 35, and she has been smoking ever since she divorced my dad. It bothers me that my mom smokes, but it's her choice and she doesn't do it inside the house. However, I have been driving her around(She hates driving), and she is constantly smoking in the car. I don't like the smoke and I know how harmful it is. What's the best way to ask her to not smoke in the car while I'm in it? I've talked to her before about smoking, but she doesn't want to quit.(That's her choice) How do I convince her to stop smoking while I'm in the car with me?
Thanks for any help!
 
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