It sounds logical and makes sense but that doesn't mean it is correct. ALL RCTs I have found so far on mask usage all come up with "no significant difference" was noted. The masked group and the non masked group infection rates were virtually the same. Where I live it's cold enough you easily see your breath with or without a mask when exhaling, if you can see the water droplets escaping in an exhale with a mask then you can have the virus in that vapor also.