I always thought I covered it up really well. Closet smoker. Wore a hat and had a special jacket. I cringe about that now because I now know that there was NO covering it up all the way. I try to be very careful about not being judgmental as I swallow down a gag when near to somebody who just smoked a cigarette, after all...I'm sure I made people have the same reaction and I didn't mean to do that to them!
The strongest reaction I have had was very recent and it wasn't just sensory, it was emotional. I work in a hospital and evaluating a patient who wasn't long for the world...a life-long smoker who's O2 saturations kept plummeting down to about 65%...her brain was starving for air and she was confused. It was just so sad. Her son and daughter in law came in while I was in the room and the smell of them hit me like a brick. To see the son sobbing because he was losing his mother and unable to control his addiction...my compassion for him was immensely powerful. My own mother is dying of cancer and I thought I would be just like him...still smoking when she passed.
Ya - I did the layers too...and border-line OCD hand/face washing and tooth brushing. There is no avoiding the stench - the best you can hope for is to mitigate it.
Sorry about your mother.