As many as 7% of young drivers admit to getting behind the wheel "on a cocktail of drink and drugs".
Research by the road safety charity Brake suggests motorists between the age of 17 and 25 are a particular hazard on the roads, with 84% of those admitting to drink-driving saying they did so while taking drugs.
More than 20% said they had been a passenger in a car with a drink or drug driver.
Almost 40% of the young motorists who admitted drink/drug driving also said they had crashed while at the wheel.
Of those who admitted driving under the influence and then having a crash, 73% were male.
More than a quarter of the young men surveyed believe that males are better than females at handling drink or drugs and believe they are therefore safer driving under their influence.
Brake chief executive Mary Williams said: "There is frightening evidence that drink and drug driving is endemic among a significant proportion of our new generation of drivers, which bodes very ill for the future."
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