As I said earlier, I did tell my mum how sick her smoking in the car made me feel, and she simply told me I was wrong, and it wasn't the cigarette smoke making me feel so ill on long journeys - then blithely carried on smoking in the car.
Funnily enough, now I travel in a smoke free car, I don't get travel sick - strange that, huh mum.
My mum was in denial about the problems of her smoking right to the end, and would get really snippy if any of us tried to suggest she follow her doctor's advice and stop. She was in hospital for 7 weeks, at one point, and bed bound, so she wasn't able to smoke for the whole time she was there. Dsis and I thought great - she's through the worst of the withdrawal, maybe she will stop for good now, but no. Her reason was that she had a stock of cigarettes in the house, and didn't want to waste them.
All her nighties had burn marks on the front, because she would fall asleep smoking, even in bed - she could have caused a conflagration. Thank heaven for flame proof nighties. When she died, we found out she had undiagnosed extensive lung cancer - the symptoms had been masked by her pain killers (morphine).