Smoking near hospital entrances occurs frequently despite smoke-free policies, resulting in multiple issues including second-hand smoke exposure (SHS) to vulnerable populations. Primary school children were engaged through their health curriculum to produce antismoking audio recordings for broadcast over a hospital entrance loudspeaker system to determine if this reduced smoking. Students produced original recordings against hospital grounds smoking during class workshops, from which a collection (n=16) was selected. Episodes of entrance smoking and total entrance traffic were recorded using security camera infrastructure over a 5-week period. A computer-controlled entrance loudspeaker played a message which was followed by silence until a new (different) message was played. Intensity of messaging was moderate in week 3 (every 5minutes), increasing to high in week 4 (3 minutely) and compared to no messages (weeks 1-2 preintervention) and week 5 (postintervention). Smokers presented 316 times, smoking 523 cigarettes over 155hours of observation (patients 70.6%, visitors 29.4%). SHS exposure was high given 172 others used the entrance/hour. Smoking was highest in the preintervention period (weeks 1-2), median five cigarettes/hr [IQR,3-7 (min=0, max=12)], falling to four cigarettes/hr during 5-minutely broadcasts [IQR,2-5 (min=1, max=14)] (P=.06), but zero cigarettes/hr during 3-minutely broadcasts [IQR,0-1(min=0, max=7)] (P<.0001). Postintervention (no broadcasts), smoking increased from zero to 1 cigarette/hr [IQR,0-3 (min=0, max=5)]; (P=.052). Nonsmoker movements did not change significantly between each period. Intensive (3minutely) broadcasting of short antismoking messages significantly reduced hospital entrance smoking. SO WHAT?: Health services can positively interact with the health curriculum of primary schools against tobacco use while developing low-cost strategies to effectively deter entrance smoking.