2010 Feb. 26: What kind of gas mask filter filters smoke?
Any decent particulate filter will remove smoke particulates
But removing the particulates does not necessarily make the air breathable; you must also remove noxious gases.
An activated charcoal filter is not intended to remove particulates, but it is intended to remove some noxious components.
In order to choose the proper filter, you need to know what is burning and the type of byproducts produced. Masks have interchangeable filters to allow optimal filtration for the type of substance that you’re working with