Summer is in the air, cigarette smoke is not, in Sweden’s outdoor bars and restaurants. As the World Health Organization marks World No Tobacco Day on Wednesday, Sweden, which has the lowest rate of smoking in the Europe Union, is close to declaring itself “smoke free” — defined as having fewer than 5% daily smokers in the population.

Many experts give credit to decades of anti-smoking campaigns and legislation, while others point to prevalence of “snus,” a smokeless tobacco product that is banned elsewhere in the EU but is marketed in Sweden as an alternative to cigarettes.