A total of 3 per cent of UK motorists have admitted drug-driving in the last 12 months, according to a survey.
In addition, around 11% of drivers think they may have been a passenger in a vehicle driven by someone on drugs, the poll by road safety charity Brake and insurance company Direct Line found.
Based on responses from 1,000 drivers, the survey also showed that 29% admitted they would not always speak out to stop a friend driving on drugs.
The findings come ahead of the March 2015 date for the introduction of new drug-driving regulations.
The survey showed 5% would not speak out even if their driver was clearly out of control, with young drivers (9%) and male drivers (7%) most likely to keep quiet.
Brake deputy chief executive Julie Townsend said: "Drug-driving is a menace that causes devastation to families and communities.
"We all need to stand up and fight to end it. Our message to everyone is never to underestimate the effects of illegal drugs on driving."
A Department for Transport spokesman said: "The new law being introduced next year will make it easier for the police to tackle those who drive after taking illegal drugs or abuse medicinal drugs."
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