In this edition of Oprah Daily's O Talks, Oprah has a conversation with Roland Griffiths, a researcher who studied the effects of mindaltering drugs on terminally ill cancer patients—before being himself diagnosed with terminal cancer.

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OPRAH DAILY SERIES
The OG Chronicles:    • THE OG CHRONICLES  
The Life You Want Class:    • The Life You Want Class  
The World According to Gayle:    • The World According to Gayle  
The Adventures of Adam and Gayle:    • The Adventures of Adam & Gayle  
O Talks:    • O Talks  
Oprah's Book Club:    • Oprah's Book Club  
Oprah's Favorite Things:    • Oprah's Favorite Things  

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