I suppose the 'self-interest' of desiring a cigarette outweighs the 'self-interest' of preserving your health.
Reminds me of debating Bentham in high school. If the feeling of self-interest of a murderer acts upon is greater than the self-interest of someone not to be murdered, etc...
Maybe the point is not to reduce judgment to one qualitative idea.
aka discounting time value, or something like that. "the feeling i will get now by smoking this cigarette, though fleeting, is worth to me now than the chance of years more living, or a healthier late life, if i do not smoke it".
