[marcinpieczka]

That works the same with alcohol - heavy alcoholic would probably need to be over the limit to feel ok and sober.

[Aurornis]

An important point is that drug users (alcohol included) lose their ability to judge their own impairment after a lot of habitual use.

They can even develop an ability to appear sober to casual observers while being impaired.

Feeling sober is not a reliable indicator of being sober. It’s referred to as delusions of sobriety.