Ron Smith, who came to Baltimore 38 years ago as a weekend TV anchorman but found his greatest success on radio as WBAL's "Voice of Reason," died Dec. 19 of pancreatic cancer at his home in Shrewsbury, Pa.. He was 70. In describing what being a radio talk-show host meant to him, Mr. Smith once said, "It's what I do. It's who I am. It's my creative expression." He was only half kidding when he took to referring to himself as "Talk Show Man" after a Sun columnist called him that in the paper.