There are numerous companies working on artificial noses that car manufacturers have been looking to integrate in order to have an equivalent of white noise generators but of course for smell.<p>There is no reason why just sampling the air for particular elements would not also be possible and improvement is always going to happen.<p>I can imagine not only having cars watch eye movement to eventually tell you to quit looking at your cell phone to having cars detect smoking and sensing children in the car and notifying you to stop. So alcohol present in a car should be a flag the car can at least suggest to you that it is concerned