Winston Peters videoed smoking on Otago University's smoke-free campus

New Zealand First leader Winston Peters has been videoed taking a smoko break on Otago University's campus, which is meant to be smoke-free.

The video circulating on social media shows Peters and two other men smoking in front of a no smoking sign in an alley on the Dunedin campus next to the university's Robertson Library.

According to the university's website, its campus has been smoke free since 2014.

The policy "enhances the outstanding campus experience" at the university, its website says, and is consistent with its mission statement which aims to promote "individuals' development and wellbeing".

"This policy applies to all University of Otago employees, students, visitors, contractors, volunteers, research participants and any person on any University of Otago Campus at any time, for any reason."

An Otago University spokesperson told NZME that staff weren't aware of the breach at the time so didn't speak with Peters about it.

Peters was in Dunedin meeting with students as part of his election campaign.

Peters has been contacted for comment.