With many areas in the United States seeing a spike in COVID-19 cases the CDC is now expected to release new guidelines on wearing face masks in public places. As of right now the CDC's current guidelines on their website say:
Wear cloth face coverings in public settings where other social distancing measures are difficult to maintain, such as grocery stores, pharmacies, and gas stations. Cloth face coverings may slow the spread of the virus and help people who may have the virus and do not know it from transmitting it to others.
It's also important to note that "COVID-19 spreads mainly from person to person through respiratory droplets produced when an infected person coughs, sneezes, or talks."
WGN in Chicago reports that, "CDC researchers have been conducting a scientific review about the masks during the coronavirus pandemic. Scientists wanted to find out if masks protect people from contracting COVID-19, not just prevent them from spreading it."
All I know is that in New York we've all been wearing masks and as of Saturday the infection rate was less than 1% of tested people. I think that speaks volumes for how well masks have helped slow the infection rate. Businesses in New York can even deny entry to people who aren't wearing masks.
Make your own decisions, but please stay informed on all this.