@Zoffiel,
That's very sad to hear about your friend. Around the same time I was diagnosed a work colleague's husband was diagnosed with lung cancer. The first thing she said after telling everybody about his prognosis was to add "He wasn't a smoker" Probably to avoid the "Oh, well, he brought it on himself look" He passed two months after initial diagnosis.
I doubt in this day and age whether there are many demographic groups that get sneered at and segregated as much as smokers.
Honestly, you could sit in the gutter and shoot up and people would just say that you needed help. You can sit on your arse in Maccas every day and stuff yourself till your 250kg and people will say you have a problem and need help.
You light up, out in the open air, generally on a footpath or in a gutter, which is where us leppers have to stand these days and you will get dirty looks or the fake cough cough as someone walks past, normally after taking a 3m wide berth around us filthy disgusting people who are all going to get lung cancer. I saw one lady give me that look one day as she put her baby in the pram that was directly beside her idling diesel car exhaust. LOL
The list of contributing factors as to what might cause breast cancer is long and is a similar list to most other cancers. I can see where the shame bit comes in.
Every time I read "I gave up alcohol, I don't eat sugar anymore, I don't use deodorants with aluminium, I've gone organic, etc etc etc. I feel slightly guilty. Even though a few of those myths have been totally debunked there still a tiny little thought in the back of my mind. Was it those underwire bras??????
I still smoke, drink alcohol, use parabens, eat chocolate, amongst a myriad of other things that are probably on a list somewhere of how I did this to myself, ooh and I took the pill and didn't breast feed. Poor life choices caused it? Shame on me.