PROBLEM TO BE SOLVED: To provide a smoking agent with which a microbial control effect is more improved for wide kinds of microorganisms.SOLUTION: A smoking agent contains a component (A): a silver-containing agent, a component (B): an organic foaming agent, a component (C): 3 to 10 mass% of a surfactant, wherein a mass ratio represented by (component (B))/(component (C)) is 5 to 27. The component (C) preferably contains a nonionic surfactant.