Analysis by Dr. Joseph Mercola
Not a single randomized controlled trial with verified outcome has been able to detect a statistically significant advantage of wearing a mask versus not wearing a mask, when it comes to preventing infectious viral illness.
If there were any significant advantage to wearing a mask to reduce infection risk to either the wearer or others in the vicinity, then it would have been detected in at least one of these trials, yet there’s no sign of such a benefit.
There is no evidence that masks are of any utility for preventing infection by either stopping the aerosol particles from coming out, or from going in. You’re not helping the people around you by wearing a mask, and you’re not helping yourself avoid the disease by wearing a mask.
Infectious viral respiratory diseases primarily spread via very fine aerosol particles that are in suspension in the air. Viruses are too small to be filtered by a mask. Any mask that allows you to breathe therefore allows for transmission of aerosolized viruses.