My eldest brother had asthma, so my parents were generally careful not to smoke around us. They had a dedicated room in the house for smoking so that the rest of the house would get less contaminated. Fortunately, this meant that they didn’t generally smoke in the car while driving us around. Also, my dad worked and/or commuted thirteen hours a day so I was mostly around my mom, who smoked a lot less.
The car borrowing I mentioned was years after my brother had moved across the country when my dad drove his car almost exclusively alone, so at least no one else (who wasn’t borrowing the car) was engulfed.
I’m sorry you had to suffer through that.