Supermodel Naomi Campbell has spoken about her battle with cocaine addiction. Campbell said she was first offered the drug at 24.

Five years later she ended up in rehab and now attends daily Narcotics Anonymous meetings wherever she is in the world in a bid to stay clean.

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"I was at a concert in a European country and I was offered cocaine," she told GQ magazine as she recounted her introduction to the drug.

"It made me feel invincible. Like I could conquer the world. I was just completely over-confident, but it's all a misconception because when you wake up the next day it's all gone and you feel awful. And the more you take drugs, the more you want. And that's how you become an addict."

But Campbell, 36, was defiant when told her drug-taking was against the law.

"Yes, so go get the drug-dealers, not the takers. Drug-taking has been going on for centuries and everybody does it," she said.

The star, who was born in Streatham, south London, also spoke frankly about Kate Moss's drug problems. Moss was pictured in a newspaper in 2005 allegedly chopping out lines of cocaine.

The pair are close friends and Campbell said: "She is hurting herself and when it's exposed she doesn't have the space or time to help herself because everyone is looking at her. It's hard."

Campbell is pictured in an accompanying GQ photoshoot which sends up her bad girl reputation. It includes a shot of her lying naked in a bath while two police officers look on. Another picture sees her pointing a gun at the camera.

Elsewhere in the interview with former Daily Mirror editor Piers Morgan, Campbell weighed into the size zero debate and said the decision by Spanish fashion bosses to ban skinny models from the catwalk was "ridiculous".

"I see girls walking down the street or working in Selfridges who are 10 times skinnier. Nobody attacks them," she said.

During a separate interview in the US, Campbell said she regretted attacking her maid with a mobile phone.

She pleaded guilty to misdemeanour assault last month for hitting Ana Scolavino in the back of the head with the phone last March in a row over a missing pair of jeans.

A judge ordered her to undertake five days of community service and to attend a two-day anger management course.

"I felt very remorseful for having thrown the phone at someone that didn't deserve it," Campbell told US TV show Extra.

"I have a deep sense of shame for the things I've done."

The model blamed the attack on "tiredness, lack of sleep (and) just so many things".