Not yet investigated
What we have so far
About 8% of the world flushes, because the enzyme that clears acetaldehyde barely works. Those who drink anyway have a sharply higher oesophageal cancer risk — a natural experiment in carcinogenesis.
This star is on the map because the show intends to take the question apart properly — the trials, how it is actually tested, whether the thing sold is the thing studied. That work is not done yet, and nothing here should be read as a conclusion. When the investigation is published it will appear on this page.