Fraud experts are investigating claims that pharmacists have defrauded the NHS by exaggerating the number of smokers who quit.
Chemists can claim cash rewards of up to £85 per patient if they help them stop smoking for at least four weeks.
Staff at five NHS trusts in London are being investigated for suspected fraud, according to the Guardian newspaper.
An NHS Counter Fraud Service spokesman declined to reveal details but confirmed an investigation was ongoing.
He said: "Allegations of fraud involving NHS stop smoking services have been received by the NHS Counter Fraud Service.
"Our Pharmaceutical Fraud Team is exploring the possibility of undertaking an exercise to uncover similar fraudulent behaviour throughout England and Wales.
"While the investigations are ongoing, it would be inappropriate to comment further."
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