10 Pieces of Gum, wrapped in shiny tin foil.

Eating any number of pieces of gum is an action, regardless of the number of pieces eaten. 

If you eat one piece of gum, your breath has a minty, cooling effect. You have advantage on Charisma speaking checks for the next 10 minutes.

You read, in small letters, "Not advised to eat more than one piece of Winterfresh Icey Breath Gum at a time"

If you eat 5 pieces of gum at one, you're breath emits a harmful Icey cone. You can use an action in the next 10 minutes to expend an ice cone 15ft in front of you. Targets must make a Con Saving throw. DC is 8+ your Con Modifier or take 2d6 cold damage on a failed save, and half as much damage on a successful one.