They paid handsomely for a public-relations campaign that insistently denied any proof of a causal connection between smoking and cancer.

ECONOMIST: Tobacco

Narcissism, of course, wasn't invented by the Internet and it would be absurd to establish a causal connection between self-love and mass murder.

CNN: Does the internet breed killers?

Venables: Your press statement on Dec. 19 appears to suggest there is already a link between video games and aggression, when academic studies have not demonstrated any causal connection with solid, scientific data.

FORBES: Senator Rockefeller Quotes Experience, Believes That Evidence Proves Violent Movies and Games Cause Aggressive Behavior in Kids

It could be, but the Taiyuan factory is large and makes many things, both electronic and automotive, so what we know now is that these two things are adjacent to eachother, not that there is any causal connection.

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The study does not explain the connection or show a causal relationship, he said.

CNN: Experts ponder link between creativity, mood disorders