New Zealand and Malaysia have abandoned plans to introduce a generational smoking ban because of concerns that such a policy is incompatible with liberal democracy as it undermines autonomy. This paper challenges this claim by showing that smoking is not an autonomous act. Autonomy requires a deliberation of preferences, wills and inclinations. This does not occur in smokers because of three related factors: nicotine addiction, cognitive biases and psychosocial development in addiction. Nicotine addiction results in strong physical and psychological desires (...) to seek pleasure and to avoid withdrawal. This is further potentiated by conditioned behaviour. Cognitive biases explain why smokers act in ways that are detrimental to their health. Psychosocial development explains how the brains of smokers are unable to make rational decisions. This combination renders smokers unable to reflect on their actions and thus act autonomously. This stance is compatible with Mill’s view that actions that devalue autonomy cannot be considered autonomous. Defenders of liberalism should not be quick to dismiss a smoking ban and can instead foster autonomy by supporting it. (shrink)