You could certainly test this, just have a conversation every day about something random. Pick a snack food, something with a heavy advertising budget, and near

You could certainly test this, just have a conversation every day about something random. Pick a snack food, something with a heavy advertising budget, and near your phone start saying things "man I really want some (snack food) right now." If it's listening, you'll start getting ads specific to that snack food, best to try it with a bunch of different products to try and find a pattern.