You're right, and the wider point is that one should always maximize their own utility/happiness function. So also, if smoking cigarettes and eating ice cream m

You're right, and the wider point is that one should always maximize their own utility/happiness function. So also, if smoking cigarettes and eating ice cream makes you so happy that it compensates for poorer health and shorter lifespan then it's optimal for you. I was just addressing the question about lifespan/healthspan