LOS ANGELES, Feb. 15 (Xinhua) -- Smokeless tobacco does not increase American smokers' quit rates, a theory that contradicts previous findings, a new study suggests. Previous researches showed that many smokers in Sweden try to quit smoking by using snus, a form of moist, smokeless tobacco that's placed under the lip. In Sweden, snus is more popular among male smokers, and Swedish men have higher smoking cessation rates than women. The findings prompted some people to suggest that public health officials in the United States and other countries should promote smokeless tobacco as a way to help smokers quit cigarettes. But researchers at the University of California in San Diego (UCSD) exa... [Read more]