The unlit cigarette or cigar as a possible expedient gas mask.
D000042:Absorption; D000327:Adsorption; D000641:Ammonia / Q000633:toxicity*; D002713:Chlorine / Q000633:toxicity*; D005374:Filtration; D008397:Masks; D010947:Plants, Toxic; D013458:Sulfur Dioxide / Q000633:toxicity*; D014026:Nicotiana
D013458:Sulfur Dioxide; D002713:Chlorine; D000641:Ammonia