I quit smoking while with my husband who was a smoker smoked around me, it is possible you just have to realise if you want to stop you will regardless of who is doing what around you, in fact after 10 days of me not smoking my husband also quit, perhaps he saw how easy it really was, and decided it was something that he was able to do..( or maybe i nagged him to submission) 8 of my friends have also given up, although some have gone back its a good thing for people to see as it really is not as hard as we think it is and its all they need to make the step themselves.
Good luck with whatever you decide to do
ps my husband and i had been smoking 15+ years so it is easily done!!!!!!!