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Howard Marks (born Dennis Howard Marks) was a Welsh author, former teacher and drug smuggler who achieved notoriety as an international cannabis smuggler through high-profile court cases, supposed connections with groups such as the CIA, the IRA, MI6, and the Mafia, and his eventual conviction at the hands of the American Drug Enforcement Administration. At the height of his drug career, he was said to have controlled 10% of the world's hashish trade.

Marks attended Balliol College, Oxford between 1964 and 1967 to study Natural Science, with a Physics (B.A., Oxon). Among his friends at Balliol was the epidemiologist Julian Peto, and the journalist Lynn Bar