One proponent of using snus for harm reduction is Karl Fagerström, who has a PhD in psychology and is regarded as a leading researcher in smoking cessation in Sweden. Some research available today shows snus use reduces or eliminates the risk of cancers associated with the use of other tobacco products, such as chewing tobacco (the type primarily used in the US and Canada, created in a process similar to cigarette tobacco) and cigarettes. The widespread use of snus by Swedish men (estimated at 30% of Swedish male ex-smokers), displacing tobacco smoking and other varieties of snuff, is thought to be responsible for the incidence of tobacco-related mortality in men being significantly lower in Sweden than any other European country. In contrast, since women traditionally are less likely to use snus, their rate of tobacco-related deaths in Sweden can be compared to that of other European countries.