Those countries also don't have a massive drug epidemic/import war from mostly china, and a shit policy on mental health conditions.
Damn near half the population of Australia has used illicit drugs at one point or another:
According to the 2022–2023 National Drug Strategy Household Survey (NDSHS), an estimated 10.2 million (47%) people aged 14 and over in Australia had illicitly used a drug at some point in their lifetime (including the non-medical use of pharmaceuticals), and an estimated 3.9 million (18%) had used an illicit drug in the previous 12 months. This was similar to proportions in 2019 (43% and 16%, respectively) but has increased since 2007 (38% and 13%, respectively) (Figure 1).
What Australia does have is proactive health policies, prison terms with rehab, a decent chance of drug use not marking a person for life, etc.