Why in the air plan there is a caution post for smoking but not for alcohol?

The smoking policy about forbidden inside airplanes I totally agree, even considering that I´m a smoker! (not easy handle with it!) :)

I think it was a good decision, considering that the air inside the cabin is controlled, about humidity, flow, quantity, and so on; so it´s unhealthy breath in that controlled environment.

The air that we breathe inside the airplanes is coming from the engines, it´s recirculated air, so I think it´s polluted enough and we don't need anything else more to pollute it!

About alcohol,  there is some companies that are controlling what you drink (alcohol); the cabin crew somehow controls it.

But I think both should be forbidden, more you have a drink more you want to smoke ... (speaking about me) :)

Check this recent news: 

http://mashable.com////american-airlines-flight-sick-aa/#ZWhFl8KKIGqi

The air that we breathe in airplanes:

http://aerotoxic.org/about-aerotoxic-syndrome/