A 49-year-old triathlete suddenly lost vision in one eye. He was diagnosed with stage 4 lung cancer, despite never smoking.

Keyword: Risk Factor

Publisher: Business Insider

Published: Jun 13, 2026

At 49, triathlete Dave Nitsche experienced sudden vision loss in one eye. He was diagnosed with stage 4 lung cancer and told he had a maximum life expectancy of 2 years. A… [+6923 chars]

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