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The exact formulation of a cigarette varies by brand, but some of the additives commonly found in cigarettes include harmful chemicals such as arsenic, acetone, lead, and formaldehyde

Non-smokers get an extra decade of life on average, but even those who kick the habit before age 40 reduce that extra risk of death associated with continued smoking by about 90%, according to the New England Journal of Medicine

Historical perspective: the low tar lie

But in the 60 plus years that followed, we learned that smoking is responsible for many other awful diseases, contributing to the more than 490,000 lives lost to tobacco we face today