The Smencils will retain their peppermint scent for up to two years, according to PSFK, and perhaps even longer if kept inside the so-called Freshness Tubes that house the product.
Several studies support peppermint's ability to boost performance. Brian Raudenbush at Wheeling Jesuit University found that the scent of peppermint improved athletes' play when administered before a game. A Maryland middle school also experimented with encouraging students to chew peppermint candies before tests.
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