Drug addiction is a mental health issue. Punishing people for struggling with their mental health is abhorrent. 

"Drug addicts will face the prospect of losing their benefit if they refuse treatment or don't make efforts to find work, the ACT Party leader says."

https://www.rnz.co.nz/news/political/498064/act-leader-david-seymour-wants-to-see-more-drug-addicts-sickness-beneficiaries-rejoin-workforce#:~:text=ACT%20says%204100%20people%20receive,for%20more%20than%20six%20years.