A Northumberland grandmother, convicted of possessing cannabis with intent to supply, was due to take her case to the prime minister on Wednesday.
Patricia Tabram baked biscuits and soups with cannabis
Patricia Tabram, 66, from Humshaugh near Hexham, baked cannabis-laced biscuits, soups and casseroles to ease symptoms of arthritis and tinnitus.
She was convicted after police raided her home and found cannabis worth £850.
Ms Tabram is urging Tony Blair to back her campaign for the drug to be used to treat chronic conditions.
Ms Tabram is writing a book called Grandma Eats Cannabis, which will be in print soon.
Ms Tabram admitting possessing cannabis with intent to supply, when she appeared in court last month.
Proceedings were adjourned to allow for the preparation of reports and she was remanded on bail until 11 March.
The grandmother-of-two began cooking for friends using food laced with the drug after being introduced to it last year.
In her lengthy letter to Mr Blair, she claims commercially-produced medicines are more harmful than cannabis.
She also claims that since she began using the drug her dependence on the NHS has lessened.
Ms Tabram claims she has received more than 100 letters of support from all over the world, since her case came to light.