TLIK,
Unlike the Sanhedrin, modern Poskim cannot create issur. The concept of chochma uminyan is inapplicable.
There are many things we do to our bodies that causes minor damage from which we recover (or which does not pose any significant long term danger) and there is no suggestion that it is assur. Has anyone ever suggested that there is an issur to pick scabs or to pierce ears?
Alcohol does damage the brain even in smaller amounts (hence slurring of speech, impaired decision making etc.) but the brain recovers after a few hours.
Also don’t confuse dicta and psak.