Currently in America, many states are banning indoor public smoking. That means no smoking in bars, restaurants, or any other place that is deemed public. California is an example of a state that implemented this rule. But there are still places where smoking is permitted.
If you are smoking in an area that is a non-smoking area, you might hear people say the following... if you are a non-smoker, then you can learn this to say to others that are smoking in a non-smoking area.