Review (5/5): Love this item
Have severe asthma and allergies to just about all smells- ciggaret smoke, purfume, cleaning products, etc.... I have used the product at work, home, and have even traveled from DC to Texas wearing it all the way through the airport... trip down and back. I have been able to breathe the whole time without smelling anything.
It does get a little harder to breathe when walking or running because the air flow is limited... but put a fan near you or turn the air vent on above you on the plane and there are no issues. If you wear glasses you do need to be prepared to work with the nose piece to ensure yoir glasses don't fog... even then if it is really humid they are going to anyway and you will find it harder to breathe in the mask during thise times.
I have two and will be buying more of them. Cant say enough good things.