What are the precautions one needs to take to prevent oneself from being afflicted by cancer?

• Don’t use tobacco
• Eat a healthy diet
  • Eat plenty of fruits and vegetables
  • Limit use of fat in diet
  • If you choose to drink alcohol, do so only in moderation
• Maintain a healthy weight and be physically active
• Protect yourself from the sun
• Get immunized
• Cancer prevention includes protection from certain viral infections like Hepatitis B & Human papilloma virus (HPV)
• Avoid risky behaviour like unsafe sex and sharing needles.
• Get regular self-exams and screenings for various types of cancers — such as cancer of the skin, colon, prostate, cervix and breast. This can increase the chances of discovering cancer early, when treatment is most likely to be successful.

http://copewithcancer.org/about-cancer/risk-factors/