In a recent letter to the Chicago Sun-Times, Sen. Richard Durbin (D-Ill.) takes issue with my argumentthat new FDA restrictions on e-cigarettes could deter smokers from switching to vaping, resulting in more tobacco-related deaths than would otherwise occur. "Mr. Sullum needs to check his facts," Durbin says, claiming that e-cigarettes, on balance, lead to more rather than less smoking. That conclusion is based on some highly implausible assumptions.