If someone works in a candy factory can they develop diabetes from all the sugar in the air?

First of all - you have to actually be EATING it - not just smelling it.

There is NO FOOD - not even sugar - that guarantees someone will develop diabetes.

That's not how people become diabetic. That is one reason people can develop asthma. pneumonia and various respiratory problems, but not diabetes.

Type 2 diabetes is usually genetic or a lifestyle that may not be anyone's fault. Toe 2 diabetes can also happen if there is physical injury and physical trauma to the pancreas that damages or destroys the insulin producing beta cells in the pancreas. 

Type 1 diabetes usually is NOT genetic. It is an auto immune disease triggered by an acute infection with a high fevers for 2 or or more days. The I.mune system over reacts and destroys the insulin producing beta beta cells I. The pancreas. The rest be a genetic predisposition for type 2 diabetes, but often there is no family history of type 2 diabetes. This can happen at ANY age. Triggers include influenza' chicken px, pneumonia, roseola €as strep infection) and very likely rubella

, red measles, mumps, tetanus. diptheria.

No, my friend, that is NOT how diabetes develops.