Anti-tobacco movements grew in many countries from the beginning of the 20th century. But all these had little success. The only exception was Germany where it was supported by the government after the Nazis came to power. It was the most powerful anti-smoking movement in the world in the 1930s and early 1940s. The Nazi leaders opposed smoking and some of them openly said what is wrong with tobacco consumption. Research on smoking and its effects on health got better under Nazi rule and was the most important of its type at that time. Adolf Hitler did not like tobacco and the Nazi reproductive policies were among the causes due to which the Nazis started their campaign against smoking. This campaign was linked with antisemitism and racism.