Yes, it can and DOES kill. A friend of mine called me about a half-hour ago to tell me that his mother-in-law has passed and she never smoked a cigarette. At first I felt sad, and I still do, but now I also feel anger when I've thought of the times in just the past week when I see disgusting jerks who smoke where it's prohibited by clearly posted signage. :angry::angry::angry:

 

Correct. It's the most likely cause.