So we see that the invisibly small molecules we call narcotics, neurotransmitters, hormones, viruses, and genes can place their little hands on the steering wheel of our behavior. As soon as your drink is spiked, your sandwich is sneezed upon, or your genome picks up a mutation, your ship moves in a different direction. Try as you might to make it otherwise, the changes in your machinery lead to changes in you. Given these facts on the ground, it is far from clear that we hold the option of “choosing” who we would like to be. As the neuroethicist Martha Farah puts it, if an antidepressant pill
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