But the catch is Johnson died at the age of 36. So for much of his life he must have known full well the dangers of smoking. From 1966, packets in the US warned smoking may be hazardous to health. From 1970 it became a more definitive "The Surgeon General Has Determined that Cigarette Smoking is Dangerous to Your Health". That Johnson could not quit his addiction is a different matter. But the verdict is clearly less about Johnson’s tragedy as it is about teaching cigarette companies a lesson for peddling a vice.