Considering I want people to stay away from me, I usually don't wear one except were required. Even the CDCs own website says people like me, who have asthma, shouldn't wear one. The funny part though, is their sources that they cite about cloth face masks all come to a single conclusion. Cloth face masks are barely better than nothing. Surgical masks are 3 times more effective and the cloth ones need a filter to get anywhere near as good. Oh, and a loose fit decreases its effectiveness by 60%.
So, I don't trust the general public with masks. I feel safer without one so they stay the heck away from me.