Nobody disagrees with the statement that smoking shortens one's life. Smoking a pack a day for 40 years cuts off several years.
For this analysis, let's say 5 years, or 1825 days. Now, SHS is breathed at a concentration about 1/1000, or less, of what the original smoker gets. That means someone exposed to SHS continuously for 40 years will have his/her life shortened by 1.8 days. Get it?
Further, over 50% of people over 85 suffer from Altzeimers. So, if your family history estimates your lifespan to be 90 without smoking, and 85 with, then you would do well to visit the Altzeimers wing of a local nursing home, to see if you think those 5 years are worth anything.
And, no, I am not a smoker. But I also know that it is not "addictive", because I quit approximately 35 years ago.
Hmmmm. That explains why so many people have a hard time quitting.