Smile is an album by Japanese experimental doom band Boris and features guest musicians Michio Kurihara of Ghost and Stephen O'Malley of Sunn O))), both of whom have collaborated with Boris in the past. This release is the second Boris album to feature vocals on every track (the first, excluding any one-track albums, was Amplifier Worship). It delves more into experimental tendencies with a more manipulated sound and even experiments with samples.