Spanish researchers have been looking to see if there is an association between certain professions and certain cancers. They have found that there are professions linked to a higher risk of developing esophageal cancer.
The primary risks for esophageal cancer are tobacco and alcohol use but of course there are always people diagnosed who don't have any known risk factors. These researchers have found that occupations in the hotel and restaurant trade, stone cutters, wood-working, carpenters or animal handlers.
So if you work in one of these fields is this a doctor's note to quit your job? Not quite. But you should certainly use whatever safety and health precautions that are available. The first symptoms of esophageal cancer are painful and/or difficulty swallowing so if you experience this, talk to your doctor.
This is a link to the release of a summary of the study. The actual study is in Spanish.