Disposable masks cannot filter second-hand smoke. General disposable masks, basically for second-hand smoke is ineffective, if the N95 medical masks, may have a slight filtering effect for second-hand smoke, but we still can not rely on the mask to prevent second-hand smoke. Disposable masks are mainly to block the object is particulate matter, but in the smoking environment, the air not only has a lot of harmful particles, there are other more tiny harmful components, can not be completely through the disposable masks to block, so do not and smokers coexist in an environment, in order to effectively guard against the harm of second-hand smoke. Passive inhalation of second-hand smoke over a long period of time can increase the likelihood of asthma, pneumonia and lung cancer, and can also lead to impaired memory, increased cardiovascular accidents and more. If you are not feeling well, please go to a regular hospital for scientific treatment under the guidance of a physician.