ALBANY, Oct. 16 — Flanked by terminally ill people who told tales of unrelenting pain, Tom Golisano today endorsed the medical use of marijuana, and lashed out at Gov. George E. Pataki for blocking a state program to provide the drug to patients. "My approach to this issue is to return the discretion to the doctors, who are trained to make these decisions," said Mr. Golisano, the Independence Party candidate for governor. He charged that Mr. Pataki was opposed "because he is in the pocket of the big drug companies who stand to lose money if medical marijuana is made...