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"It's a total total mix of people, from 18 years old to 50 and 60, male and female," says Marcus. "Wealthy businessmen, to people really struggling - unemployed, everything. We even have kids, 18 years old. Because drugs are so normalised these days, they're getting into it at 14, 15 and by the time they're 18, addictive substances have got hold of them."