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The key factor in this interaction appears to be a brain chemical known as dopamine

Supplementary Material A Contributorship Form detailing each authors specific involvement with this content, as well as any supplementary data, are available online at Acknowledgments We thank all of our in-country collaborators for their expertise and assistance with data collection (names of collaborating organizations can be found at We also thank Stephanie Ng, Adami Osho, Kara Robinson, Deana Tremble, Rebecca Lesser, and Mustafa Sakib for coding the tobacco packs for design features and marketing appeals

Sources American Lung Association: Retrieved online April 30, 2009 from CDC: Fact Sheet Health Effects of Smoking

Smoke: Conventional cigarettes or other smoke-producing items will set off the sensors

Tip Schedule your test as early in the day as possible