Dan Haslam, the young Tamworth man whose story about using cannabis to relieve the pain of cancer was instrumental to changing Premier Mike Baird's position on medicinal use of the drug, has died.

"He never complained, he didn't stop fighting right until the end," Mr Haslam's mother, Lucy, told Fairfax Media's Northern Daily Leader.

Dan Haslam: "I will never forget the look in his eyes," said Mike Baird. Credit:Geoff O'Neill

Mr Haslam was 25. He died on Tuesday afternoon, five years after first being diagnosed with terminal bowel cancer.

Mr Baird, who credited meeting Mr Haslam with a change in his views on medicinal cannabis, said he was deeply saddened by his death.