Recognizing the advertisement was defined based on the “yes” answer of respondents to “Recently, there was an ad on television in which we see a man smoking in his office and the black cigarette smoke spreading everywhere.The ad has the following the campaign slogan, ‘second hand smoke, invisible killer.’ Have you seen this ad? [SHOW CARD WITH CAMPAIGN IMAGES].” To avoid interference knowledge of the effects of smoking and passive smoking, we measured if the respondent had seen the advertisement at the end of the questionnaire.