A woman tries electronic cigarettes at a store in Miami. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images
Illustration by Daniel Horowitz for NPR

There are new questions about the value of nicotine patches and gum in helping people quit smoking. Patrik Stollarz/AFP/Getty Images hide caption

itoggle caption Patrik Stollarz/AFP/Getty Images