As a nurse, I am sure you have already spoken to him about your concerns about his health.
The health concerns go beyond his personal needs. He should know that the second hand smoke, even off his clothing and hair, can affect your health.
Kissing him is like kissing an ash tray,as some have said.
It is not unusual nor extradordinary, that you may have to take desperate measures befor divorce.
One such thing is counselling. AND the biggest statement you can make is a brave one.
Sometimes tough love reactions are needed.
You can try moving into a seperate bedrooms. Seperate bedrooms sends a strong message.