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In reality, hereditary cancer only accounts for about 5% of all cancer cases. Most of it actually stems from environmental factors like diet or lifestyle.

According to a report by the International Agency for Research on Cancer (IARC), smoking accounts for 15-30%, chronic infections for 10-25%, and food for 30%.

Basically, because families share similar eating habits and lifestyles, they end up getting the same types of cancer. It just *looks* like it's hereditary.