Baker Mayfield was spotted poppin' a ZYN during "Monday Night Football" ... but if you thought the company behind the nicotine pouches would be thrilled with the free promotion -- think again!!
Swedish Match -- which manufactures ZYN -- got wind of Mayfield catching a buzz before the second half of the Buccaneers vs. Ravens game at Raymond James Stadium ... and let's just say it had a mixed reaction to the moment.
"Swedish Match appreciates its loyal consumers and encourages them not to show the product in any situation where someone under 21 years old could see it," a ZYN spokesperson told TMZ Sports.