Instead under 25s are more likely to use so-called 'party drugs' like cocaine, cannabis and ecstasy.
The drugs are often taken on nights out along with large amounts of booze.
With such a radical shift in the drug taking habits of young people, are the treatment services available to help the addicts.
And to what extent does the current drug policy need to change to tackle the problem?
Young people tell their stories alongside The National Treatment Agency and professional health workers.
Cannabis Cocaine Drug policy drugs Health Heroin MDMA Youth