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5. Prompt Method We use 40 v/v% whisky or similar alcohol, dripping on a gauze, inhale the vapor slowly at room temperature. (1) Drip 1~2 ml (1~2 g weight ) of alcohol 40 v/v%, such as, whisky, on a gauze. (2) Cover your nostrils with gauze (point where you drip the alcohol).(3) Slowly and carefully inhale the vapor. If one of your nostril has narrowing, block other one. (4) After a few tens of seconds, the smell of the ethanol will disappear, then stop.