I dont mean to seem, umm, uhhh, well let me start over.
Think about all the chemicals you ingest every day. By that I mean EVERYTHING. Chemicals in foods, trace amounts of all sorts of interesting things in the water you drink. Pollutants in the air you breathe. Do you smoke or drink? Are you 420 friendly? Do you live in a big city? Do you use a cell phone? Do you take OTC pain killers when you have a headache? Do you take something for cramps when you're on your period?
You're worried about using a little vaseline to remove mascara and eye liner?
Do you know how much vaseline they had to feed to 1000 lab rats before ONE of them was found to have breast cancer?
If you began trying to eliminate all the things in your environment that were thought to contribute to the possibility of developing breast cancer you would end up living in a cave and subsisting on nothing but distilled water, free range chicken, and organic bean curd. Go ahead and remove the vaseline from your daily regimen, it's a start, right?
Edited to add: I do not mean to make light of your health concerns or the threat that breast cancer poses to women.