American X Factor judge and singer Demi Lovato has admitted she can't smoke or drink without it getting out of control.
The 21-year-old Heart Attack singer - who has previously been in rehab for addiction issues, an eating disorder and self-harm - admits she knows she can no longer indulge in alcohol in a "responsible" way.
"Some people can smoke and drink recreationally. I'm not one of those people. If I do that, it will spiral out of control very quickly. I've lost the privilege of being able to drink responsibly," she said.
Demi admits it was difficult to stay sober when her father died earlier this year, but she knew how important it was to stay "strong" as giving in to one addiction would only spell more problems.
Speaking to OK! magazine, the former Disney star said: "I've definitely struggled a lot with drug and alcohol addictions - even more than with my eating disorder.
"But I decided to stay strong when my father died. I worked so hard on my sobriety - I wasn't going to give it up.
"When I feel like I want to give up I think to myself, 'No, what about the 17-year-old girl that's been free of self-harming for nine months?'
"If I give up my sobriety, that would mean it would be OK for her to go back to self-harming."
In another recent raw and revealing interview, she admitted that at the height of her troubles she couldn't go longer than "30 minutes to an hour" without cocaine, and would even smuggle it onto aeroplanes.
She said part of her wake up call was when she took a Sprite bottle to the airport filled just with vodka and was also throwing up in the car on the way there - at just nine in the morning.
Talking to Access Hollywood, the former Disney actress said: "Something I've never talked about before - but with my drug use I could hide it to where I would sneak drugs.
"I couldn't go 30 minutes to an hour without cocaine and I would bring it on aeroplanes.
"I would smuggle it basically and just wait until everyone in first class would go to sleep and I would do it right there. I'd sneak into the bathroom and I'd do it.
"That's how difficult it got and that was even with somebody [with me], I had a sober companion, somebody who was watching me 24/7 and living with me [and] was able to hide it from them as well."
The 21-year-old also said she was very good at manipulating people, and told countless lies to make it look like there was nothing wrong.
She continued: "I'm very good at manipulating people and that was something that I did in my disease, I would manipulate everyone around me.
"There were times I would just continue to lie, so that everything looked OK on the outside."
The Heart Attack singer, who's spoken openly about her eating disorder in the past , pulled out of a tour with the Jonas Brothers in 2010 to check into Chicago's Timberline Knolls treatment centre to address "emotional and physical issues".
Her rep at the time said: "Demi has decided to take personal responsibility for her actions and seek help."
It later emerged she punched her backup dancer and friend Alex Welch in the face. "When you punch someone on a plane, enough is enough," the singer said of the incident. "I felt like she betrayed me."
Demi's mum Dianna said she suspected her daughter could have been using drugs.
Also talking to Access Hollywood, Dianna said: "It's like any other parent, when you see things, when you see signs you don't want to believe that's what's actually going on. So when they're telling you that's not what is going on... you want too badly believe them and I think for a long time I was in denial."
The actress, just 19 at the time, said she eventually had a moment of clarity where she realised that it wasn't just "young and rebellious" behaviour where she was just having fun.
"It was, 'wow, I'm one of those people... I gotta get my s**t together'," she revealed.
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