This study aimed to find out the effect of the implementation of the Smoke-Free Area policy on reducing smokers' proportion. This research was an ecological studies design, which compares 2007 to 2013 smoker proportion by implementation of the local Smoke-Free Area policy in Jakarta, Yogyakarta, Bali and West Sulawesi. This study was done by analytical conceptual approach, as well as the comparative approach. The result showed that the implementation of the local Smoke-Free Area policy tend to have influence on reducing the proportion of daily smokers. Factors that contributing were commitment of the local government; consistency of law enforcement; regular supervision; stakeholder compliance; positive support from education and tourism sector; and active participation of civil society organizations.