Researchers should also try to find impacts of wearing masks on different age groups. People can experience different symptoms or impacts.  Continuous use of mask can give you a burning  feeling in eyes  headache, throat rash, dry cough,fatigue. Longterm usage can impact your respiratory health and lung disease. In fact by continuous usage, we are not breathing in fresh air and oxygen impacting our overall health. People who use mask most of the time will not be as fresh after all nights sleep. In another few years more doctor visits can be expected for respiratory  ailments.