A Smoker's Signature is a way to tell if someone smokes but this method is not 100% accurate but it can be used as an indicator that someone smokes.

The actual signature is that when a smoker sneezes they will not make much sound because their lungs can't hold in as much air as non-smokers can. Their lungs are often constricted as if they have asthma and therefore will not retain much air inhaled before they sneeze.

When you eat dirt for the first time and leave your family to build a shack in the woods