Smile was a magazine aimed at teenage girls. At first it was supposed to be a mainstream teen mag similar to Seventeen, but with added manga; later, it became more focused on manga and removed most of its other features. It was discontinued in 2002. It was published by TOKYOPOP.
Sailor Moon, Peach Girl, and Juline were serialized in the magazine. Sailor Moon was originally serialized in MixxZine but Mixx moved it to Smile because Mixx wanted to refocus MixxZine towards high school and university/college-aged readers. Smile serialized the SuperS story arc, while earlier story arcs not finished in MixxZine were finished in individual comic book publications.
References
Smile (magazine) Wikipedia(Text) CC BY-SA