Maybe you do not believe that any antismoking campaign can have any effect on the smokers. Such advertisements are designed for cautioning and although it may not be effective at first seeing the same ad again and again definitely make one think about the ill effects of smoking.
These ads sometime cross the decency limit warning the mass with the danger of smoking. This page includes examples of many such creative antismoking campaign ads for bringing awareness about the hazards of smoking. We hope that these will really work to save mankind. via boredpanda