Each year, the WHO selects a theme for the day in order to create a more unified global message for WNTD. This theme then becomes the central component of the WHO's tobacco-related agenda for the following year. The WHO oversees the creation and distribution of publicity materials related to the theme, including brochures, fliers, posters, websites, and press releases. Videos were created as a part of the 2008 WNTD awareness campaign for the theme "Tobacco-free youth" and published on YouTube, and podcasts were first used in 2009.