This has been going around for a few years... science sez drinking is bad, then good,then bad.
A friend of mine with no family history of breast cancer, developed a pretty nasty form of it. Her risk factors were that she is overweight and smoked.
She's been smacking the snot out of the Big C now for a couple years, has survived mastectomy, radiation, chemo, special radiation treatment when it spread to her liver... she was and is not a heavy drinker. (she credits surviving cancer to her strong religious faith, and catching it early)
My guess? Smoking, and being obese probably contributed to the cause but you just don't know these days who is going to get it and who isn't. I think that in some cases, the risk factors are "obvious" (mother, sister, aunt had/have it) but in other cases it's a crap shoot.
I'm a homerewer who kicked cigs over a year ago thanks to
vaping (yay!). I enjoy moderate drinking. Not worried.