A grandmother, who is facing drug dealing charges, sampled a pudding laced with cannabis outside the gates of Downing Street on Wednesday.
Patricia Tabram, from Northumberland, also delivered a letter to the prime minister, asking for the drug to be legalised on medical grounds.
Mrs Tabram, who was not allowed into Downing Street because she had not made an appointment, said: "The cannabis masks the pain. It is a herb and I want people to call it a herb. It is no different to sage, thyme or rosemary.
"It makes me feel pleasant. It takes away the feeling of despair and makes me feel optimistic about life instead of pessimistic."