Gas – Alcohol MQ-3

This alcohol sensor is suitable for detecting alcohol concentration on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.

So, to do some empiric testing and get drunk!

empirical alcohol gas sensor testing

Arduino tutorial with more than enough info