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I have no first hand knowledge of this but I've heard that colonoscopies are very common in S. Korea, even starting at younger ages.

Can anybody comment on this?

I have heard they have a massive drinking culture without the genes to handle it so stomach and colon cancers show up a lot.

I don't think genetics really play any part in handling alcohol's part in the forming of cancer.

If it did then Finland shouldn't really have the incident rates of alcohol caused cancers as they do.

The same probably goes for other nations where heavy alcohol consumption has been a norm for centuries.

Alcohol causes cancer, and there is no intake amount that is beneficial to the body.