He's only 3 years old, but Landon Riddle is already the focus of a medical marijuana fight in Colorado.lt;br /Landon has acute lymphocytic leukemia, a cancer of the blood and bone marrow. It's the most common cancer in children.lt;br /His mother says his condition has improved so much following treatment with medical marijuana that chemotherapy isn't needed. But the Children's Hospital of Colorado, she says, disagreed.
