Should we pay people to quit smoking or lose weight? Would paying them amount to coercion? Is there a risk that if we start paying for healthy behaviour, its value will be corrupted? Is paying unhealthy people unfair to those who already lead healthy life styles? In this video interview (with Katrien Devolder), Dr Rebecca Brown from the Oxford Uehiro Centre for Practical Ethics responds to these and other concerns and defends the use of financial incentives as a tool for health promotion.