These masks block particulates but do nothing about fumes, vapors, gases etc. Smoke does damage through particulates, gasses, lack of O2, and heat. The amount of damage done in these cases by particulates is minimal compared to that done by gasses and lack of O2. Save your pennies until you can get an Evac-u8 if is all you want is to prepare for smoke. OTOH, if you might be using this during structural collapse as well then you will be dealing with a much higher level of particulates and in such situation you will want something better than your shirt and the n95 masks will help there. But they will be mostly useless against the dangers of smoke.