Former Boston Red Sox pitcher Curt Schilling said that it was his use of smokeless tobacco for 30 years that caused oral cancer that required both radiation and chemotherapy."I do believe without a doubt, unquestionably, that chewing is what gave me cancer," Schilling said.Schilling, who appeared weak and hoarse, had never revealed the nature of his cancer until Wedneday when he made the revelation on WEEI radio during the station's annual Jimmy Fund fund raising broadcast.Photos:  Curt Schilling through the years"It's a dangerously addictive habit that I wish I had never done," Schilling said.  Schilling said he had been unable to kick the habit even though he suffered pain and bleeding during the years he used smokeless tobacco."I am in remission," Schilling said, adding that he lost 75 pounds during his illness.  "(However), I don't have any salivary glands.  I can't taste anything and I can't smell anything."Earlier this year, the 47-year-old ESPN analyst announced he was being treated for cancer and had undergone surgery, but never revealed the nature of the disease."It could be so much worse," Schilling said. "It could be one of my kids."Schilling's doctor, Dr. Robert Haddad of the Dana-Farber Cancer Institute, said the pitcher’s prognosis is very good.Last year, Schilling told the Boston Globe he had a heart attack in November 2011 and had surgery to place a stent in one of his arteries.He said he experienced chest pains while watching his wife, Shonda, run in the New York City Marathon.Shonda Schilling also battled cancer after being diagnosed with stage 2 malignant melanoma in 2001.Schilling pitched in the majors for 20 seasons for the Baltimore Orioles, Houston Astros, Philadelphia Phillies, Arizona Diamondbacks and Boston Red Sox. The six-time All-Star finished with a record of 216-146 and a 3.46 ERA. His 3,116 strikeouts rank 15th all time.