Is cancer preventable?

Some. For example, smoking is the biggest cause of lung cancer but some people have lung cancer that have never smoked or been around smoke. There are many environmental causes of cancer that can be controlled but there are other cancers that are not fully understood.
Sometimes. Some ways we think will reduce your chances of certain cancers: stay active. Avoid toxins such as tobacco smoke, excessive drinking, excessive sun exposure, and industrial carcinogens. Eat a diet rich in vegetables. Maintain a healthy weight. Stay positive and optimistic. Also, try to catch cancer early while it can still be potentially cured by getting regular screening.