However, within four months of starting her cannabis oil treatment, she developed large lumps the "size of my first" in her left breast.
She changed suppliers and within "two weeks of her sending me a coconut oil infusion those lumps were gone".
Now cancer-free, Leigh said she now makes her own cannabis oil to heal cancer and sells it to suffers.
She also sells it in balms and spray to limit those in pain from arthritis, even though it is illegal.
She was provided with cannabis oil (stock image) by someone she met online, and says within eight months she was returning clear blood scans. Photo / 123rf
Despite this, she claims she has helped more than 50 people improve or heal their cancer.
"I'm a criminal because of what I do. I don't want to live like this," she said.
"I've seen this save lives and in the face of what I know, I can no longer be quiet.
"There's other people out there that have got such strong results. You need to hear their stories."
If the stigma of cannabis use was removed, Leigh believes it would be a more popular treatment with people of all ages.
Following a law change in New Zealand, doctors can now prescribe medical cannabis without approval from the Ministry Of Health.
This means that your local doctor will be able to prescribe you medical cannabis just as they would any other medicine. The move is expected to improve patient accessibility to medical marijuana and bring New Zealand cannabis laws "in line with international developments".
A new Government medicinal cannabis bill progressed to select committee on January 30.
It would increase the availability of cannabis-based medicinal products for the terminally ill and the proposed bill would also provide a criminal defence for anyone terminally ill charged with possession of marijuana.