Eat a healthy diet and maintain a healthy weight.
Obesity increases the risk for at least 13 different types of cancer,
Obesity is associated with metabolic and endocrine dysfunction, including alterations in sex hormone metabolism, insulin, and insulin-like growth factor pathways, and inflammatory pathways. The evidence for a role of sex hormone metabolism and of chronic inflammation in cancer development is strong. Also eating processed meats increases inflammation and cancer risk slightly.
Vaccinate yourself (or your loved ones) against cancer-causing viruses, like Human Papilloma Virus (HPV) or hepatitis B virus (HBV). Vaccination should be a part of a healthy lifestyle.
Be careful with sun exposure. UV rays increase the risk of skin cancers.Protection against UV radiation can be considered a healthy lifestyle. Avoid tanning beds for sure!
 Lung Cancer Fact Sheet
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