Conducted by the Lesbian and Gay Foundation (LGF) and the University of Central Lancashire, the poll also found one in five of those surveyed shows signs of dependency on drugs or alcohol.
Campaigners described the findings as a “wake-up call”, while specialists warned that gay people risk being “excluded” from traditional drug treatment services, the Independent reported.
The report, who sampled more than 4,000 people over two years, warns that there is “significant problematic substance use among lesbian, gay and bisexual people” and a risk of “substantial hidden harm”.
The most widely used substances among those surveyed were party drugs such as cannabis and poppers, followed by powder cocaine, ecstasy, ketamine and amphetamines.
They were 10 times more likely to have used cocaine in the last month than the wider population, and 13 times more likely to have used ketamine. Heroin use was comparable among both populations, but the use of crack cocaine was again higher among the gay community.
Feelings of “rejection” and “fear” as well as “shame around sex” could be factors leading to substance abuse, said David Stuart, education, training and outreach manager at London Friend, the UK’s only targeted LGBT drug and alcohol service.
He added that drug services “aren’t equipped” to deal with the shifting drug trends, noting that “while government funding is linked to crime prevention and drugs like crack and heroin, less than 2 per cent of lesbian, gay and bisexual people use these drugs.”