Usually, smoking with a mouthpiece filter serves a purpose. Pipe filters 

can filter out some of the harmful substances produced when cigarettes 

are burned to a certain extent, such as tar, nicotine and so on. 

   The principle is to physically filter the smoke through the filter layer, 

so that the filtered smoke is relatively purer. For some people who want to reduce 

the harm of smoking to the body, the use of mouthpiece filters can to a certain 

extent reduce the amount of harmful substances inhaled into the body, 

thus to a certain extent to the body to play a certain role in the protection. For example, 

for people who are often exposed to secondhand smoke, 

the use of a mouthpiece filter can reduce the inhalation of harmful substances in 

secondhand smoke; some people who have just begun to try to quit smoking 

but find it difficult to quit immediately, the use of a mouthpiece filter can gradually 

reduce the dependence on nicotine, helping them to better transition to smoking cessation.