China is a very populated place and a poor area, so they don't eat as much fast food as us Canadians do, so maybe that could also be a reason of why china has the least death. If green tea will actually benefit you, then people should start to consider drinking it! maybe once per week or something, but who knows if its the green tea that's saving people. I'm sure there must be something else that people in China do that's rather special, but I don't know. I heard lung cancer was the a top cancer that caused death worldwide, so smoking should be the main death to cancer in china. Also, China doesn't have a very clean environment, so they are constantly breathing in a dirty place, so I'm not sure why they have the least death to cancer.
and yeah this is a good article to talk about, makes you wonder how to live a longer life.