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Addiction can affect us all, whether it's substance abuse or simply not being able to live without access to your phone.

In on Radio 1 this week, Gemma Cairney and Dr Radha look at addiction in all its forms and offer advice on the best way listeners can break addictive habits.

Addiction is major issue for many celebrities as well. Here are 9 personal accounts from major stars about the struggles they faced with substance abuse in their private life.

For , her worldwide fame came at a price and she started using drugs as she struggled to cope with her celebrity status.

"I’ve been addicted to various things since I was young," she told . "Most heavily over the past seven years... But, the truth is that it is very hard to be famous."

She turned to drugs after hip surgery in 2012 for pain relief but admits her dependency on illegal substances escalated.

"I was smoking up to 15-20 marijuana cigarettes a day with no tobacco," she said.

"I was 18, I dabbled in everything. I wanted to be Jack Kerouac," Matty told

"I thought I was as decadent as all of that. I thought: the world will catch up."

He admits he even considered taking drugs to write second album, he wanted to write the record "from the gutter."

He said that having already beaten addiction once, he chose to avoid that route.

"I already had been well into that and come out the other side," he told the magazine.

After the success of the Harry Potter movies (you may have heard of them), Daniel Radcliffe admits he turned to alcohol to deal with the pressures of fame at such a young age.

"The drinking was unhealthy and damaging to my body and my social life. That’s beyond question," in 2012.

"I was living in constant fear of who I’d meet, what I might have said to them, what I might have done with them, so I’d stay in my apartment for days and drink alone."

"I was a recluse at 20. It was pathetic - it wasn’t me. I’m a fun, polite person and it turned me into a rude bore."

Daniel quit alcohol in 2010.

Zac Efron may seem like one of Hollywood's healthiest stars, but in 2013 he entered rehab in an attempt to deal with his addiction problems and has spoken openly about his struggles with alcohol.

"I was drinking a lot, way too much,"

"It's never one specific thing. I mean, you're in your 20s, single, going through life in Hollywood, you know? Everything is thrown at you."

However, after seeking treatment for his problems, he now says entering Alcoholics Anonymous and seeing a therapist has given him a new lease of life.

"I just started going. And I think it's changed my life," he told the magazine.

"I'm much more comfortable in my own skin. Things are so much easier now."

is one of pop's most open and honest pop stars, and in 2013 the Cool For The Summer star admitted to struggling with cocaine and alcohol addiction issues during the early years of her career.

"I couldn’t go without 30 minutes to an hour without cocaine and I would bring it on airplanes," in 2013.

She had previously struggled with depression, anorexia and had self-harmed.

Demi left completed a stint in rehab in 2011, but as recently as 2016 she admitted that she avoids all temptation in her personal life to avoid a relapse.

"I had to learn the hard way that I can’t do parties anymore. Some people can go out and not be triggered, but that’s not the case for me," last year.

star Corey died in 2013 after taking a mixture of drugs and alcohol aged 31.

He had previously admitted to struggling with addiction issues since his teen years, in 2011 that by the age of 16 his drug use was "out of control".

He told the magazine that he knew he had a "serious problem" with drugs in his late teens and that he stole money from a family member to fund his drug habit.

from survived addiction to become a member of one of the world's biggest pop groups, The Black Eyed Peas, but battled with drugs for many years.

"From ecstasy it went to crystal meth," Fergie told Oprah Winfrey in 2012.

"With any drugs, everything is great at the beginning, and then slowly your life starts to spiral down. I was 90 pounds at one point."

Fergie says she managed to quit drugs when she discovered God.

Thrift Shop rapper turned to alcohol when he was in his early teens, as well skipping classes in school to smoke marijuana. He also became a user of prescription drug Oxycontin, which he describes as 'synthetic heroin'.

Macklemore says that the one thing that saved him from succumbing to addiction was his music, having been rapping since the age of 13.

"The thing that pulled me back was knowing that I wanted to be a musician and that if I wanted to do this I had to get sober,"

"So I'd go a month and be sober, make a bunch of music and then fall back off and vanish for a couple months and go back and forth like that.

"That's how I made music for the majority of my teen years and twenties."

He went to rehab in 2008 and says doing so probably saved his life.

"If it wasn't for that rehab centre, I probably wouldn't have been here," he says.

Daughter of Sharon and , admitted in 2009 to having an addiction to prescription painkillers in her teens to cope with her mum's diagnosis with cancer in 2002.

"I was trying to stay strong so I took Vicodin to hide the terrible sadness. But by this point, I was waking up and emptying six Vicodin into my hand," she wrote in her book Fierce in 2009.

"Soon I was taking 50 pills a day. Most people would overdose on ten."

She entered rehab to seek treatment for her addiction issues and is now drug free.

"I have one or two glasses of champagne every now and then," she told

"I don’t tell people I’m sober because I do have the occasional drink but I never take drugs. I don’t mess around. When I think about how much my life has changed for the better and all the things that I’ve overcome, what is the point in going back to that?"

Listen to Radio 1's addiction special on The Surgery at 9pm, Wednesday 1 February 2017