(TNS) — After a Delta passenger was told to spit out his tobacco-free nicotine Zyn pouch on his flight, people are confused about airline policy on the smokeless products.

Under Transportation Security Administration regulation, travelers can bring nicotine pouches like Zyn on both carry-on and checked luggage, according to the media website Vaping360.

However, some airlines may have their own policy on the matter.

The Delta passenger posted about the occurrence on the Reddit thread r/delta, saying he “didn’t know that was a thing,” according to the New York Post.

“Delta flight, first class (not that that matters). They brought a cup out and asked me to spit my Zyn out,” the flier said. “They said it was because it was a tobacco product. I didn’t put up a fight and complied right away.

“Was just wondering if this was an FAA thing I didn’t know about?”

The New York Post said most airlines are vague about whether nicotine pouches or gum are permitted to be used on their flights, but nearly all airlines bar the use of e-cigarettes and smokeless tobacco.

Delta’s website makes no specific mention of them in its flight policies, and the same can be said for American Airlines, United, Southwest Airlines and JetBlue.

A Delta representative reiterated to the New York Post that smokeless tobacco is prohibited and was unclear about pouches and other tobacco-free products such as gum and patches, the outlet reported.