"Serendipity" was released as the lead single from the album on May 20, 2015. It has peaked at number 6 on the Weekly Singles Chart, but failed to enter the Japan Hot 100. The song was used by West Japan Railway Company for the promotion of San'yō Shinkansen.

"Sawage Life" was released as the second single from the album on July 30, 2016. The song was written by the American singer-songwriter Porcelain Black and Bobby Huff and featured as the ending theme song for the Japanese animation program Case Closed.

"Yesterday Love" was released as the third single from the album on January 11, 2017. The song was released on Blu-ray and DVD format and has peaked at number 3 on the Oricon Music Blu-ray Chart. The song was also featured as the ending theme song for Case Closed.

Smile sold 11,910 copies in its release date and debuted at number 4 on the Oricon daily chart behind Big Bang's Made, Scandal's Best Album "Scandal" and Leo Ieiri's 5th Anniversary Best. It peaked at number 2 on the chart on February 16, 2017 with selling 4,220 copies in a day. The album debuted at number 4 on the Oricon weekly chart with selling 21,222 copies in its first week.

As of March 1, 2017, the album has sold 25,439 physical copies in Japan.

Credits adapted from the CD booklet of Smile.

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Wikipedia