The Mount Sinai incident happened on Sunday, July 14, according to Suffolk County Police.
At approximately 12:15 p.m., Alexzia Diaz Garcia was working at MT Smoke and Vape, located at 5507-3 Nesconset Highway when she allegedly sold an underage person Zyn nicotine pouches.
She was arrested and charged with second-degree unlawfully dealing with a child.
Garcia, age 18 of Coram, will be arraigned at a later date, authorities said.
Click here to follow Daily Voice East Hampton and receive free news updates.