If this study leads some smokers to smoke inside because they believe the researchers, who say that thirdhand smoke is no less harmful than secondhand smoke, then this could lead to serious public health harm to children.

In fact, the subjects had no idea that they were part of an experiment involving artificial manipulation of their news feed for the purposes of potential inducing happiness or sadness as part of a research study. This potential use of their Facebook account is simply not mentioned in the Data Use Policy. The policy states that the information provided by users may be used for research purposes. It also states that the information may be shared with outside vendors to conduct research. However, nowhere does the policy state that users agree to intentional manipulation by Facebook staff for research purposes.

According to the letter: "Today Rep. Henry A. Waxman, Sen. Tom Harkin, and Rep. Peter Welch sent a letter to California Attorney General Kamala D. Harris, Iowa Attorney General Tom Miller, and Vermont Attorney General William H. Sorrell urging them to classify electronic cigarettes as cigarettes under the Tobacco Master Settlement Agreement (MSA) to prevent e-cigarette companies from targeting youth and getting them addicted to their products. ... Classifying e-cigarettes as cigarettes under the MSA would prohibit tobacco companies from targeting youth in advertising and marketing of these products."

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