Benefit of DTC ads?

A study shows some unexpected side effects from DTC ads:

In a recent study, Alan Mathios found that people who read more magazine ads for nicotine gums and patches (sold to help smokers quit) were more likely to actually quit than people who read fewer of the ads. The finding, to be published in a forthcoming issue of the Journal of Political Economy, held true whether or not the people bought the advertised products.

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