Helen Kelly says she is "more determined than ever" to campaign for access to cannabis after a difficult few weeks without it overseas.
The terminally ill former Council of Trade Unions president has been in Cuba receiving "last ditch" treatment for lung cancer.
She has been unable to access cannabis since she left New Zealand around August 23, and in a Facebook post said she has had a "very tough time with pain" while overseas.
Kelly said she has been taking morphine every four hours instead of once or twice a day when she has access to cannabis.
"I need my cannabis and am more determined than ever to campaign for it. It is obvious to all who spend time with me how well I was doing on it," she said.