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In page Michael Landon:

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In April 1991,[1] Landon began to suffer from a severe headache while he was on a skiing vacation in Utah.[2] Three days later, he was diagnosed with pancreatic cancer, which had begun to affect the tissues and blood vessels around his pancreas.[2] The cancer was inoperable and terminal.[2] Landon said that he believed his smoking and drinking had caused his pancreatic cancer, and that he had tried to quit smoking after co-star Victor French died of lung cancer.[citation needed]