In 2012, there were an estimated 170,000 drug users in Malaysia. A majority of the intravenous drug users in the country abused heroin.
Of all the drug arrests in the country, about half were for abusing opiates.
The heroin that is used in Malaysia is trafficked from Myanmar, Laos and West Asia.
Source: Liz Gooch, “Malaysian Mosque Is Also a Methadone Clinic,” New York Times, March 28, 2012.