The Implementing Rules and Regulations (IRR) of the Tobacco Regulation Act of 2003, is more precise as to what can be considered a public place.
The IRR also dictates that in enclosed places open to the population, such as public and private workplaces and other areas not stated above (such as malls) owners, proprietors, operators, possessors, managers and administrators are required to establish smoking and non-smoking areas.
The palace is an enclosed area, right? So I think he would not be allowed to smoke there (maybe outside he can), but the MMDA's "environmental enforcers" would not dare tell our highest ranking official that he's not allowed to smoke inside the Palace wherein our President is a well known chain-smoker. ^^,
But I trust that our President would abide with our policy. I am only hoping that he should limit his smoking because he should be a model for the citizen and smoking is really bad to our health and body.
Maybe if he knows or dating a Young Lady Doctor maybe he'll be persuaded to quit? What do you think? ;)