But our methodology where students work in pressurised teams and professors are always asking questions means that the programme can become addictive.

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The problem with amnesties is that they become addictive to state officials, leading to giveaways on some tax bills that would have been collected later anyway and encouraging deadbeats to put off paying until the next offer.

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We also uncovered evidence that the antidepressant was addictive, that it could make some adults self-harm and become suicidal and that clinical trials had shown that these effects were also possible in children who took the drug.

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Despite that admission, as late as 1994 the chief executives of the big tobacco companies in an image that had by then become famous raised their right hands and told Congress that they did not believe tobacco was addictive.

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