Answer:
This is a very hard question to answer without more information. However, nowadays people smoke less and less and smoking in common areas is forbidden and frowned upon. Assuming Judy is the host, she could be more or less permissive on the kind of party she was hosting, the age and background of the attendants, how close she was to Don, whether she smoked or not, and other factors. But, out of respect for non smoking guests I'm guessing she would ask Don to put out his cigarette before coming in, as it could bother other guests.