When I started HRT in 1996, I was using tablets and I was told in no uncertain terms, smoking is a NO!!! So I quit and endured the beginnings of puberty sans nicotine. It was pretty brutal for a month or so as I also quit drinking at the same time. Never discussed it with anyone, but they certainly figured it out in a hurry.
That time around lasted 7 months and even after I chose to stop HRT, I decided to leave those vices alone going forward and I honestly feel it has been a positive in my life. I am not a T-Totaller, my choice to stop was for medical reasons. As the healthy side started to become apparent, it made sense to me to just leave it alone.
When I started HRT again, my endo asked me about my habits and when I told her I had quit decades ago as I began HRT. She asked if I was willing to quit again and when I explained I never started again, she BEAMED!
Anything that can reduce our risk factors seems like a positive step.