BPAs have been shown to absorbed through the skin. Headphones are increasingly worn for long, continuous periods. Unlike other plastic objects which are handled for shorter periods.

I’m not entirely convinced of the danger myself (tinnitus seems a bigger worry for headphone use to me), but I thought it was a matter worthy of further discussion.

I did wonder this myself. Can it enter the body via normal usage? And if so, in what dose? Enough for us to care?

I don't make a habit of putting headphones in my mouth, but young children do things like that.

Wait.. What do you mean with shouldn't injest.. I thought it was perfectly fine: https://en.wikipedia.org/wiki/Michel_Lotito