[samatman]

I said "habit-forming" rather than "addictive" for a reason, yes. That habit can be quite physically destructive, you can find papers on the effects of a heavy habit out of China which are somewhat toe-curling. It's not capable of stopping breathing or causing cardiac arrest, dying of an overdose isn't practical.

However, ketamine can make the brain go... weird. Like cocaine and amphetamine, habitual/binge use gets psychotogenic, and while bizarre delusions won't usually kill you (or anyone else), they can absolutely fuck up relationships, or earn someone a brand-new one with the authorities. Opiates, for all their terrible flaws, don't do this.