Even if you're not sick, if you visit hospitals and work in environments where you might encounter people who are unwell and aren't wearing masks, it would be good to wear one. You can also reuse a personal mask that isn't soiled as long as you take care in how you remove and put it on, and have a container/bag for it. Obviously, if someone ran up to you and coughed into the mask, dispose! Haha.Again, people will complain that 4 is too little. You can never satisfy the people here. I agree with the view that you should not have to wear a mask if you're not sick. There is simply not enough supply to go around - even during periods without such a crisis.