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dog eaten cigarette but ate What To Do If Your Dog Eats a Cigarette Butt? Pet Secondhand Smoke Fact Sheet
Description
Heres the bottom line

In the United States, some 50,000 people die from sicknesses caused by secondhand smoke

For starters, tobacco use causes more plaque and tartar buildup
Psychopharmacology (Berl) 1989;98:33441

These studies have shown that people who quit at a very young age so by their 20s or early 30s tend to have a similar life expectancy to people who have never smoked