Size alteration

Size alteration is the ability to control one's size, either to grow or shrink in physical stature.

Mainstream Smurfs Media
In mainstream Smurfs media, size alteration is mainly done through magic. In the comic book story "The Smurfnapper", Gargamel had potions that could turn him into a giant or shrink him to Smurf-size, though near the end of the story, when he drank what he thought was the formula to make him into a giant, he found out that the Smurfs switched the contents of the bottle so that he drank the shrinking formula instead. In the cartoon episode "The Incredible Shrinking Wizard", Gargamel found himself shrinking whenever he behaved badly, and growing whenever he did something good and heroic. In "The Magnifying Mixture", Hefty was accidentally grown into a giant Smurf when Brainy dumped a magnifying formula he created in Papa Smurf's laboratory onto him, and was shrunk back to his normal size with an antidote.