1800s cigarette cards Rose Collecting Military Tobacco Cards -

One thousand bootstraps were performed to assign confidence levels to the nodes in the trees (Felsenstein 1985)

Case measures 3" x 4"

As a result of smokers moving to less effective smoking cessation aids or not using any medication or nicotine replacement at all to help them quit, an estimated 4,200 fewer would have stopped smoking for good in a year, the researchers found

For comparison, one car produces 4 million times less

The perceived risk of smoking declined in the United States between 2006 and 2015, according to a separate study published Monday in the journal Drug and Alcohol Dependence

Regul Toxicol Pharmacol 81(Suppl 2):S17S26 McNeil A (2012) Reducing harm from nicotine use