It's not an amphetamine or stimulant, the article explained: it doesn't make you high, or wired. It seems to work by restricting the parts of your brain that make you sluggish or sleepy. No significant negative effects have been discovered. Now students are using it in the run-up to exams as a "smart drug" - a steroid for the mind.
http://www.huffingtonpost.com/johann-hari/my-experiment-with-smart_b_156954.html
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