Like everything else boingy...people will need education on the safe use of them. They can serve a healthy purpose while out among the general population. I never apply common sense for the general population as a rule as I have seen much evidence to suggest that very little common sense is applied usually as standard. Each individual will have to adapt to their new circumstances...and many will revert to the Lemon standard.....I think if used properly...masks are a good idea at reducing transmission.
It is important to remember that when taking the mask off, you do not touch the mask surface with your hands...if you do...then wash or use alcohol sanitizer....It is the one fundamental mistake made by many.....