Mark Fischetti offers this chart to those struggling with kicking a bad habit:
"I hate when someone tells me that something is risky," says David Spiegelhalter, a professor of risk assessment at the University of Cambridge. "Well, compared to what?" To answer his own question, Spiegelhalter converted reams of statistical risk tables into a simple metric: a microlife—30 minutes.
(Chart by Jen Christiansen)