Washington, Mar 28 (ANI): Welsh singer-songwriter Duffy has vowed that she will never endorse another product again, after her TV commercial for Diet Coke was criticised by U.K. campaigners over road safety fears.

Duffy, 24, who is currently promoting the low-calorie beverage in a European advertising campaign, is seen riding a bicycle through dark streets without a helmet or reflective gear.

The singer was criticised for the promo by officials at the Royal Society for the Prevention of Accidents, after it debuted last month.

"Unfortunately, advertisers do forget sometimes to make sure they are showing safe and legal behaviour when someone is using the road in an advert," Contactmusic quoted the officials as saying.

And now the star has pledged not to market any other brands, and to focus solely on her music instead.

"I have only got 100 per cent to give and all of that goes towards being creative, so I can't really open the doors to all the other things," she said.

"I have so many desires creatively, but I have to tread carefully that I also don't sell myself out personally.

"What you see with me is what you get. I just put my whole energy into the creative side," she added. (ANI)