I look in the mirror and still see the same person, however this doesn't bother me, I never expected physical change.
One thing I will note though is that I was never able to look at myself in the mirror when I was drunk or high. I saw the red eyes, the drunken grin and it filled me with disgust. It got to the point that I would look at the floor when passing by to use the toilet and when I washed my hands I would just stare down into the sink. That won't ever happen again and I guess there is a sense of pride and power in that.