DES viewers have been left distracted by Dennis Nilsen's chain-smoking - moaning they've been left "short of breath" from the constant haze.
The ITV drama follows the case of serial killer Dennis, who murdered more than a dozen men at his London home from 1978 until 1983.
Dennis is played by David Tennant in the drama, while Daniel Mays plays the detective in charge of his case - DCI Jay - and Jason Watkins stars as Dennis' biographer Brian Masters.
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