"If somebody tells you, you have six months to live, very possibly you will because you believe that," the actress said. "So for me, psychologically, it's better not to have any idea of what they expect or what the last person that has what you have lived, so I don't-- I don't tune in."
Instead, her philosophy is that "every day is a gift." She's also grateful for what she has overcome so far in her health battles. "I'm so lucky that I've been through this three times and I'm still here," she said with a smile.
After hearing the news, fellow Aussie Hugh Jackman took a moment during his "The Man. The Music. The Show" tour in Sydney, Australia to send a message of love and support to Newton-John.
"Hi Olivia, it's Hugh and 15,000 of your friends and fans," the "Greatest Showman" star said, panning his camera to show his large crowd. "You are the most amazing person, the most amazing mom, the most amazing ambassador, singer, dancer [and] we love you."
He then led the crowd in shouting "We love you, Olivia!"
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Newton-John went on in her interview to speak about the health benefits of cannabis in her cancer treatment regimen. "I'm incredibly pro cannabis," she told "60 Minutes Australia" reporter Liz Hayes. "If I don't take the cannabis, I can feel the pain so I know it's working."
Originally diagnosed with breast cancer in 1992, Newton-John beat that diagnosis and remained cancer free for more than two decades, until it recurred in 2013. In 2017, she was told that it had metastasized and spread into her bones.
In speaking with Newton-John's husband, John Easterling, he said he believes medicinal marijuana is playing a huge role in Newton-John's overall health and battle. The actress is treating her cancer with a combination of traditional and alternative medicines.
"I don't use the word cure," Easterling said. "But I'm confident. We had MRIs showing a lesser number of tumors, and the majority of the other ones are shrinking."
In fact, the actress is so passionate about the health benefits of medical marijuana that her own Olivia Newton-John Cancer Wellness & Research Centre is planning a clinical trial to determine its effectiveness in helping patients with cancer in an effort to increase its availability in Australia.
For Newton-John, the "plant" -- she emphasizes it is a plant and not a drug and the use of that word is a big part of why it's become stigmatized -- makes a "huge difference" in her own cancer treatment in California and she wants to share those benefits with her home country.