High school students whose friends posted photos of drinking and smoking were about 20 percent more likely to become drinkers or smokers themselves. iStockphoto hide caption

itoggle caption iStockphoto

Smoking can mess up your looks, according to an ad campaign aimed at keeping teens from smoking. Courtesy of U.S. Food and Drug Administration hide caption

itoggle caption Courtesy of U.S. Food and Drug Administration

Tobacco companies incorporated doctors in their ads, such as this 1930 Lucky Strike campaign, to convince the public that smoking wasn't harmful. Stanford University hide caption

itoggle caption Stanford University

The FDA is expected to determine whether e-cigarettes should be regulated like tobacco products later this month. Jim Watson/AFP/Getty Images hide caption

itoggle caption Jim Watson/AFP/Getty Images

Candy-flavored cigars like these in a shop in Albany, N.Y., are the focus of efforts to restrict sales of sweet-flavored tobacco. Hans Pennink/Associated Press hide caption

itoggle caption Hans Pennink/Associated Press

Newport is the most popular menthol cigarette in the United States. Sales of menthols has increased though cigarette sales are declining overall. Paul Sakuma/Associated Press hide caption

itoggle caption Paul Sakuma/Associated Press

Harry Patel, an employee of Blondie's Deli and Grocery, talks on the phone while waiting for customers in New York on Monday. A new anti-smoking proposal would make New York the first city in the nation to keep tobacco products out of sight in retail stores. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP

A sign protesting a beverage tax in Richmond, Calif. The U.S. soft drink industry has fought proposals that would put a tax on sugar sweetened beverages like sodas and energy drinks. Braden Reddall/Reuters /Landov hide caption

itoggle caption Braden Reddall/Reuters /Landov

The iPhone app Electronic Smoke simulates smoking by detecting sound waves. When you breathe into the microphone, the virtual cigarette burns. Screenshot from Electronic Smoke. hide caption

itoggle caption Screenshot from Electronic Smoke.

A man smokes a bidi on "No Tobacco Day," May 31, in Allahabad, India. These small, hand-rolled cigarettes are popular in India and Bangladesh because they are far cheaper than regular cigarettes. Rajesh Kumar/AP hide caption

itoggle caption Rajesh Kumar/AP