No it's not difficult to separate the two. You test a bunch of people that have ... | Hacker News

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		moheeb on Dec 9, 2011 \| parent \| context \| favorite \| on: Over 40% of cancers due to lifestyle, says review No it's not difficult to separate the two. You test a bunch of people that have never smoked and see what the effects are. I bet this has been done before.

scott_s on Dec 9, 2011 [–]

It's difficult for someone who is self-reporting to do - if all you have is an anecdote. It's not difficult with good experimental design, which is part of my point.

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