There are worse jobs out there that can lead to an early death or poor health. The biggest contribution to your health you can make is taking care of yourself. Avoid stress, try to get your body's optimum sleep each night (6-9 hours), eat plenty of vegetables and fruits, minimize carbohydrates and processed foods, exercise regularly, and drink... lots of water, not so much coffee and keep the alcohol consumption within reason.
Do screen yourself for skin cancer regularly. For whatever reason, our group seems to be at a higher risk of melanoma. Some think its caused by exposure to ionizing radiation, due to high altitude flight and operations in high latitudes.