Trying To Weed Out The Confusion

(I am ringing up a customer who has several packs of alcohol and two packs of cigarettes. My coworker is bored, so she’s trying to help me by bagging everything.)

Coworker: “Would you like a bag?”

Customer: “No, I don’t smoke.”

(My coworker and I exchange very confused looks, and then stare at his cigarettes, wondering what he’s talking about, before he seems to realize something.)

Customer: “Oh! You mean for the alcohol! No, I’m good. I thought you wanted me to buy weed from you, and all I could think was: ‘Why would I buy weed from you? I don’t even know you!’”