One October night in 2004 in Liberia, Mr Scott Harrison chugged seven cans of beer and finished two packets of cigarettes.
There was a reason for the alcoholic and nicotine binge - it was his last dalliance with these habits. The next day, the then 29-year-old New Yorker would be walking up a gangway to board Mercy Ships, an old cruise ship converted into a floating hospital.
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