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INTRODUCTION: Sugars naturally occur in tobacco leaf but are also commonly added to cigarettes by tobacco companies. Added sugar increases levels of toxic chemicals in cigarette smoke. Little is known about smokers' knowledge of added sugar in cigarettes and awareness of its effects.

METHODS: Adult cigarette smokers were recruited through Amazon Mechanical Turk to participate in an online experiment on electronic cigarette advertising. After completing the experiment, participants (N = 4351) answered two items assessing knowledge and awareness of added sugar in cigarettes. Participants had the option of providing open-ended comments about the overall study, and two reviewers read and independently coded comments pertaining to the sugar items.

RESULTS: Only 5.5% of participants responded "yes" to the question: "Is sugar added to cigarettes?", and only 3.8% of participants indicated being aware that added sugar increases toxins in cigarette smoke. Forty-eight participants mentioned the sugar items when asked to comment about the overall questionnaire. Fifty-two percent of these comments expressed an interest in obtaining more information about added sugar, and 23% described the sugar items as interesting or informative. Three participants commented that learning about added sugar motivated them to quit or cut down on smoking.

CONCLUSIONS: Among a large sample of smokers, few reported knowledge of added sugar in cigarettes and awareness of its effects. Further, several smokers expressed an interest in learning more about added sugar. Messages about added sugar in cigarettes may be a promising new angle for campaigns to discourage smoking.

IMPLICATIONS: Few American smokers are aware that sugar is added to cigarettes, and some participants expressed a desire to learn more about this additive. Given such low awareness, the interest among smokers, and increased popular concerns about added sugar in foods and beverages, messaging about added sugar in cigarettes should be developed and tested for inclusion in public health media campaigns.