Jeepney drivers smoking cigarettes

Dear PAO,

My son recently started commuting to school on his own. Part of his commute is a jeepney ride through the main road of our town. He told me that he noticed that a lot of the drivers of the jeepney he rode were smoking cigarettes while driving. This bothered me because my son has a respiratory illness which could be triggered by the inhalation of tobacco smoke. Because of this, I want to clarify if there are already laws prohibiting this and what do they say about jeepney drivers smoking while driving. God bless your Office. Thank you very much.