Hi there!! Cilia are very small fine hairlike projection's/tissues, who's primary responsibilities in the airway is to make sure that it is clear. To be more specific... Cilia line the airways' trachea down. These cilia will do two things; They will trap germs and particulate matter (dust, dander, etc..), before then moving the trapped objects upward to the area where the airway meets the larynx, where you then swallow it... Additionally you can expel it eventually with a cough.
Answer:
this is because they are trying to end the pain they have inside and for the moment while doing these activities the pain goes away or is transferred to another thing.
Answer: 1st one is synthectic drug 2nd psychoactive drugs 3rd is prescription drug 4th is illegal and 5 th over the counter drugs
