Cigarette companies need young people to start smoking, because their customers eventually die off, many of them from the habit.
So it is encouraging that a group of Belfast teenagers have made a film aimed at persuading their peers to either stub their cigarettes out or, better still, never light up.
Young people never listen to their elders, so, perhaps, they will heed their own age group.
And for the adults who still indulge, just give up for today, No Smoking Day.
It could be the start of the rest of a much longer life for you.