NO!!: There are unfounded and unscientific claims for a number of substances. Any possible effect for most of them can be explained as placebo effect!
Answered 3/18/2014
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Java, java: Although not thought of as a drug by most people, caffeine has been shown to increase attention and concentration in people using it. Unfortunately, tolerance to this effect can develop, so taking a "coffee holiday" for a while can restore this beneficial effect.
Answered 4/17/2013
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