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Hitler stopped drinking alcohol around the time he became vegetarian and thereafter only very occasionally drank beer or wine on social occasions. He was a non-smoker for most of his adult life, but smoked heavily in his youth (25 to 40 cigarettes a day); he eventually quit, calling the habit "a waste of money". He encouraged his close associates to quit by offering a gold watch to anyone able to break the habit. Hitler began using amphetamine occasionally after 1937 and became addicted to it in late 1942. Speer linked this use of amphetamine to Hitler's increasingly erratic behaviour and inflexible decision-making (for example, rarely allowing military retreats).
