Miley Cyrus introduced her mum Tish to smoking marijuana.

Tish Cyrus has revealed her pop star daughter encouraged her to try weed a decade ago after she was involved in a terrifying tour bus fire which left her unable to sleep - she followed Miley's advice and has been a regular user ever since.

During an appearance on the 'Call Her Daddy' podcast, Tish, 56, explained: "I did not smoke pot until the 'Bangerz' tour, 10 years ago. I was like: 'This is the devil, the gateway drug'.

"But we were on tour and I'm on a brand new tour bus with [daughter] Noah and Miley's manager. I'm going to sleep, but there is a fire from a burst tyre.

"We pull to the side of the road, I'm trying to get Noah, my dog and to wake the manager up. Three minutes later, the bus exploded. My pyjamas, laptop everything burnt. It was crazy."

Tish went on to experience trouble sleeping and she initially tried sleeping pill Ambien but it made her feel "so bad" and Miley told her she should try smoking weed instead to help her nod off.

She added: "Miley was like: 'Mum if you could just smoke weed'. That's how it started. I started smoking to go to sleep ... I am a Christian and I love weed.'

Miley had previously been known to smoke marijuana herself, but she has since given it up and has been sober for the last few years.

The 'Wrecking Ball' star previously explained her decision to give up booze and drugs, telling Elle magazine: "I don't think that everyone has to be sober, everyone has to do what's best for them.

"I don't have a problem with drinking, I have a problem with the decisions I make once I go past that level ... I become very impulsive ...

"That's why it's never easy, but it's pretty easy for me to be sober or in and out of sobriety because it's like the day I don't want to ... do it anymore, I don't. The day that I do, I do."