I was just thinking about this this weekend because we went to visit my father and step mother who are super chain smokers. They smoke in the house and it's hard for us to visit but we do. They have (had 3) dogs and have just lost one recently to old age. He was 20 years old when he died. He spent his entire life with my father and always breathed his smoke. So, I wondered this weekend how he was able to live so long and not be affected by the smoke.
Just interesting. |