COPS sent texts to 2,000 people who bought cocaine from an Albanian gang to offer them support for drug abuse.
The mobile numbers were discovered on two phones seized from the organised crime network who flooded the streets with drugs.
Customers were told their dealers had been arrested, with a link offering support for substance abuse clicked on 1,852 times.
Police forces across the country have been targeting addicts and regular clients of dealers with advice, The Times reports.
City of London Police tracked down 12 Albanians caught with 1.2kg of cocaine worth £144,000, fake identity documents and £20,000 in cash.
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They were caged for between 25 and 64 months at Inner London Crown Court and the Old Bailey over the last 12 months.
Ringleaders Bledar Ponari, 28, and Fjoralb Fera, 21, peddled drugs across London’s financial district as they directed eight couriers.
Detective Constable Lee Johnson, who led the eight-month investigation, said people using drugs were not aware that they were fuelling violent crime and slavery.