Analysis into wastewater around the country in 2020 reveals an estimated 11.1 tonnes of methamphetamine was consumed in Australia as well as 5.6 tonnes of cocaine, 2.6 tonnes of MDMA and one tonne of heroin.

The 12th report of the National Wastewater Drug Monitoring Program [...] estimated $8.9bn was spent on the four drugs, 78 per cent of which, or $6.96bn, was spent on methamphetamine through analysing samples from 56 plants across the country. Alcohol and nicotine remain the most consumed drug, but methamphetamine is the illicit drug with the highest rate of consumption. However, overall rates were down compared with the year before.