One miner, Samuel Avalos, noticed how a group of his colleagues would peel away, he suspected, to smoke the drug.
But, he said they 'never even offered me one' although he was desperate to relieve the stress of his predicament.
The book's author, New York Times journalist Jonathan Franklin who gained special access to the rescue operation, said the small amount of drugs 'created more tension than it relieved' and claims worried officials discussed using a sniffer dog to intercept drugs before they were posted.
Incredible. Heroes to stoners everywhere. [Daily Mail]