Apart from mentioning the increasing incidence of lung cancer and many of the causes behind it such as dust , exhaust gas from cars , tuberculosis , X-ray and pollutants emitted from factories , Müller 's paper pointed out that `` the significance of tobacco smoke has been pushed more and more into the foreground '' .
Apart from mentioning the increasing incidents of lung cancer and many of the causes behind it such as dust , exhaust gas from cars , tuberculosis , X-ray and pollutants emitted from factories , Müller 's paper pointed out that `` the significance of tobacco smoke has been pushed more and more into the foreground '' .