According to a survey, up to 70 percent of motorists think not enough is being done to tackle the problem of drug-driving.
The poll by Confused.com found that more than a third (37 per cent) of motorists believe drug-drivers are less likely to get caught than drink-drivers.
A total of 5 per cent of the 2,000 drivers polled admitted to driving while under the influence of drugs. The figure rises to 8 per cent for 25 to 34-year-olds.
In the 45-54 age range were those most likely to drink and drive, with 34 per cent admitting to the offence.
A total of 25 per cent of men and 18 per cent of women believed drug-driving was more widespread than drink-driving in the UK.
28 per cent of those questioned admitted to drinking and driving, the figure rising to 38 per cent for men, the poll found.
Confused.com chief marketing officer Mike Hoban said: "The government has been boasting about cutting public service advertising but it's clear people are concerned about the potential dangers of drug-driving.
"The government has a responsibility to let drivers know that the penalties are severe and that drug-drivers are a danger to themselves and to others."