Asthma and smoking: still a prevailing topic.

1. Divisão de Pneumologia, Instituto do Coração, Faculdade de Medicina da Universidade de São Paulo, São Paulo (SP) Brasil. In the last 20 years, there has been a significant, progressive decline in the prevalence of smoking in both genders, worldwide(1) and in Brazil,(2) where that decline has been more pronounced. From 1980 to 2012, the worldwide prevalence declined from 41.2% to 31.1% in men and from 10.6% to 6.6% in women.(1) From 1989 to 2013, the prevalence of smoking in Brazil declined from 43.3% to 18.3% in men and from 27.0% to 10.8% in women.(2,3)