Second hand smoke. Need advice!

Jessica • Mom of 2 boys, 1 girl🧒🏼👦🏼👦🏼26 years young. Engaged💝💍
So my mom doesn't know yet that I'm pregnant so whenever I go out with her she smokes while in the car. I'm not ready to announce my pregnancy yet but I know that I can't be exposed to smoke. What should I do?