PROBLEM TO BE SOLVED: To provide a liquid smoke-emitting transpiration agent that can be subjected to transpiration in the smoke form into the atmosphere by heating, as well as to provide a method for the transpiration of a chemical agent using the liquid smoke-emitting transpiration agent, and a chemical agent transpiration device used in the implementation of the method.SOLUTION: A liquid smoke-emitting transpiration agent has the following characteristics: (A) it is a liquid smoke-emitting transpiration agent containing a chemical agent and a solvent； (B) the solvent has a boiling point of 170°C or higher； (C) the average vapor pressure of the transpiration agent at 20°C is 0.1 to 10 Pa； and (D) the average molecular weight of soluble components contained in the transpiration liquid agent is from 150 to 250.SELECTED DRAWING: None【課題】加熱することで大気中に煙状に蒸散させることができる液状発煙性蒸散剤、並びに当該液状発煙性蒸散剤を用いた薬剤の蒸散方法、及び当該方法の実施に使用される薬剤蒸散器を提供する。【解決手段】液状発煙性蒸散剤は下記の特徴を有する（Ａ）薬剤及び溶媒を含有する液状の発煙性蒸散剤であって、（Ｂ）上記溶媒の沸点が１７０℃以上であり、（Ｃ）蒸散液剤の２０℃における平均蒸気圧が０．１～１０Ｐａ、（Ｄ）蒸散液剤に含まれる可溶性成分の平均分子量が１５０～２５０。【選択図】なし
