The 54-year-old star was diagnosed with incurable lung cancer two years ago.
In addition to orthodox medicines, she explained how she had also been using cannabis to help with her condition since she received the diagnosis.
“I decided to integrate plant medicine into my healing programme, and I began to use cannabis oil high in THC medicinally from the day I left the hospital two years ago,” she wrote.
“I have been committed and consistent in using it as a vital component of my journey to healing, both alongside regular treatments, and when none was offered, on its own.
“Only stopping in recent months when I embarked on the trial,” the former Emmerdale star continued.
Leah said she had just passed two years from the day when she received her diagnosis of stage 4 lung cancer.
Speaking about making cannabis oil at home, the star, who recently finished the first phase of a drug trial, said: “Many thousands of people prefer to medicate using the plant itself, smoking it for quick pain relief, or like myself making it into an oil in order to ingest the large quantities required for maximum healing.”
She said she had found the cannabis effective in helping to cope with the side effects of her prescription drugs, especially during chemotherapy treatments.
Leah told fans recent scans, following the end of the first phase of her drugs trial, have shown her cancer is “stable”.
She explained her results mean she has hope for the future, saying: “It means that I can remain on the trial for now, until the next scan is performed in six weeks’ time, and the cycle of anxiety once again cranks into motion and I brace myself for the frightening possibility of the tug of the rug from beneath my feet.”
Last month, Leah showed her 917 Instagram followers how she had been coping with painful injections which were part of her treatment.
She uploaded a series of pictures of blue latex gloves with different faces drawn on in marker pen.
“Introducing Geez,” she captioned one snap, explaining in the comments section how her nurse had helped her deal with the pain by blowing up gloves and putting ice in them.
“Just so you know, the Geez, so named by my fabulous nurse David, is in fact an ice bag to ease the OUCH from the world’s longest injection which I receive regularly,” she said.
“(Ok I may be exaggerating but it did hurt before the Geez) and a smile is great pain relief! Long live the Geez!!”
Her fans also took to the comments section to share their support and remark on the sweet and original take sonf pain relief.
“Iron injection survivor here,” one said. “Ouchie OUCH I can understand/sympathise. My hips still hurt even though I’ve not had them for years.”
“Thanks Leah, I needed a chuckle to cheer me up and that worked a treat!” another wrote. “Loving the Geez!”
“Oh sweetheart much love,” a third said, while a fourth added: “I love your sense of humour Leah it’s a joy.”
Leah was diagnosed after seeing four GPs in 10 days before being admitted to A&E.
She has since spoken out to campaign for more funding for the NHS, saying: “Where would we be, where would I be without it? Not here and now, that’s for sure.”
Full story is available here.