My mum lives alone and is a very heavy smoker. I visit her twice a week.
During the summer it isn't as much of an issue as she will have the windows and door open and we tend to sit out on the terrace.
But in the winter her flat is full of smoke and she gets snipey when I open a door or say something about the smoke. Her argument is that it's her home and no-one should tell her what she can or can't do......
I've got to the point where I'm going to say to her that I (and the grandchildren) are not going to come and visit - I'm happy to take her out etc, but I/we're not sitting in a smoky flat.
I had breast cancer 3 years ago and so I am aware that I can be more sensitive paranoid about health issues so it would be helpful to check if I ABU