There has been a lot of conversation on the subject of masks for use in a Pandemic. It is up to each individual as to whether or not they feel that they would like to wear one. There is no conclusive evidence that a mask would definitively protect you in a Pandemic. However, it certainly passes the 'common sense' test of usefulness. In order for the mask to be effective, it is essential that the mask be comfortable. If the mask is uncomfortable the wearer will inevitable 'fool' with it and compromise the barrier that it helps to create. It is generally agreed that masks as a part of a layered approach to protecting oneself against influenza will be a healthy idea. Other layers that should be used in conjunction with masks include: not going to crowded venues, keeping a distance of 3 feet or more from others and of course HAND WASHING!

Here are some resources on masks, if you would like to read more:

Simple Homemade Mask Article