This hilarious vintage Star Wars Smoking PSA isn't exactly the most convincing, but it sure is worth the watch. The PSA starts off with a frazzled C-3PO looking for his buddy R2D2. He later finds him smoking up a chimney in a back corner of the transformer room. R2D2 claims that "Smoking is grown up" and later, C-3PO goes on to say that it is bad for the heart and lungs.
At one point of the Star Wars Smoking PSA, C-3PO stands and talks straight into the camera, telling children that smoking is dangerous and "not adult." I'm not certain that this PSA deterred any children from picking up a pack of cigarettes, but I am hopeful that there was at least one kid out there that didn't want to let C-3PO or R2D2 down.