Seems you've gotten a ton of good advice.
I've never been a smoker, my wife (then girlfriend) had smoked for probably 25 years and that included watching her mother die from lung cancer AND her aunt acquire emphazima.
Long story made longer

, she (wife) was in bed one night and evidently awoke with some kind of chest pain. It REALLY spooked her and she quit "that day", however, she had to use the nicotine gum as a crutch as she replaced her habits (cig when get up, cig when get in car, cig after eating...)
she munched on the gum for I'd guess a year? and then weaned herself off the gum.
To the best of my knowledge, she has never backslid from day 1 of this chest pain. She had tried before but as others have said, until YOU are really ready to make the change, it ain't gonna happen.
I've always told a restauraunt I'll sit in first available, smoking or non smoking.
Now that my wife is a non smoker, she like some others here, has a real distaste for sitting in a smoking section. She also now thinks that the clothes of smokers stink...(funny how she never "got that" when I tried to tell her).
Point being, she is FAR more intolerant about second hand smoke than I ever was (and I was fairly intolerant).
Good luck to you in your challange... don't give up, you don't want to fail yourself or just as importantly, your loved ones.