'It's the best sex, the most delicious meal, the most engrossing book…' A former addict confesses all

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This is an edited extract from Portrait Of An Addict As A Young Man, by Bill Clegg, published by Jonathan Cape on 10 June at £12.99. £12.99. © Bill Clegg 2010. To order a copy for £11.99 (including UK mainland p&p), go to theguardian.com/bookshop or call 0330 333 6846.