Antismoking ads, paid for by tobacco companies, appear to have no effect on teen smoking.
In fact, they may encourage some teens to light up.
Researchers gathered data on TV ratings in 75 U.S. markets.
They combined that information with results from a yearly national survey of 8th, 10th and 12th graders.
They found antismoking ads targeted at teens did not alter teen smoking outcomes in any way.
Ads targeted at parents led to a stronger approval and intention of smoking among 10th and 12th grade students.