[NoPie]

I believe it is very possible.

My android phone often asks how did I like this or that shop. Sometimes I was just passing by those shops but on average the phone is quite correct which shops I have visited.

Google knows when you are in the pharmacy and might use a different routine interpreting ambient sounds when you are there. Voltarol (ibuprofen gel) is a distinct sound that even very lossy algorithm with low level of processing power can distinguish with a sufficient level of accuracy.