Can't Teach An Old Dog

I just got off the phone with my aunt, she and my uncle have been nursing bad cold for days now. They haven't been out, the only time they went out was to vote on Tuesday when we had a special senatorial election. Anyway, my uncle's condition was a lot worse because he was coughing uncontrollably. I talked to him for a short time but we were cut off because of his persistent coughing. I wanted to scold him for his stubbornness and lack of common sense sometimes because he just couldn't give up smoking Swisher Sweets and cigarettes despite his condition. Even he doesn't listen to my aunt. Well I guess you can't teach an old dog a new trick.