Maybe have a private conversation with him, letting him know of your concerns. If he carries on because he's so addicted to drinking, then I'd reckon either leave him be or inform the boss (letting him know before you do so).
To answer your question- yes it is normal to pretend nothing's wrong. Most of us don't want to meddle in other people's problems.
A work colleague might have a problem
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Maybe have a private conversation with him, letting him know of your concerns. If he carries on because he's so addicted to drinking, then I'd reckon either leave him be or inform the boss (letting him know before you do so).
To answer your question- yes it is normal to pretend nothing's wrong. Most of us don't want to meddle in other people's problems.