Smoking is bad for you, smoking is bad for those around you, and smoking is bad for your cat. A new study shows that cats with smoking owners are twice as likely to develop feline lymphoma. That's not a statistic to cough and splutter at. If you needed another reason to quit, do it for your feline friend.
I wonder if the RSPCA (and other equivalents) will start prosecuting smokers with pets. That would be an interesting precedent to set: people being sued on behalf of their terminally ill animals.