Crown Princess Mette-Marit, like many other members of the royal family, enjoyed her cigarettes for years until she finally claimed she'd kicked the habit while pregnant with Norway's new heir to the throne.

It appears she's gone back to puffing, though. Magazine Se og Hør published photos this week of the crown princess smoking at a wedding this summer.

The photos have prompted the head of the Norwegian cancer society (Kreftforeningen) to offer Mette-Marit courses on how to stop smoking.

"The crown princess is one of the country's most photographed and visible women," said Anne Lise Ryel, secretary general of Kreftforeningen. "It's negative and sad that she's seen as a smoker."

King Harald, like his late father King Olav, was also a heavy smoker, but reportedly quit when he fell ill with bladder cancer two years ago.