This study’s initial aim was to investigate literature on Smoke Free Work Hours and its effects, but preliminary results based so far on four reviews and 20 underlying studies used in these reviews, indicate that Smoke Free Work Hours is a purely Scandinavian model, and that literature on the concept is scarce. Apart from this, we find, that the extent of legislations and rules regarding workplace smoking differ worldwide as well as the research concerning smoking regulations in workplaces. We thus see a need for a review describing the different types of regulations and rules used worldwide to prevent smoking in workplaces. Our adjusted research strategy thus aims to categorize the different kinds of smoking regulations used worldwide and the outcomes of the different regulation types. The strategy is still based on the key words as mentioned in the former abstract, but will only include reviews on smoking regulations and the studies used in these reviews to look into details regarding the smoking regulations. Preliminary findings indicate, that the stricter the regulation the greater the effect on smoking prevalence. This knowledge can contribute as a guideline for decision-makers when considering new kinds of smoking regulations.