There are also studies that say they don't work, at least, not if they're not N95's and you make sure there is NO WAY for air to get past the filters--which is not very comfortable and its difficult to make yourself understood. For what it's worth, I only wear them to make others feel comfortable. I don't believe they do anything to protect me.

Also, you may lose some of your taste, or things will taste weird. That symptom is sometimes delayed.