Foreign Minister Hishammuddin Hussein apologised after being pinpointed by a netizen for vaping during a Parliament session this week.

"Sorry, I didn't realise - it's a new habit.

"I apologise to the Dewan (Rakyat) and promise to not do it again," he said.

Umno's Sembrong MP issued the apology on Twitter in response to the video of the House session, in which Hishammuddin could be seen taking a puff as he was seated behind Transport Minister Wee Ka Siong, who was speaking during proceedings.