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Agreed. It's like wearing shoes that are too small so you can have the "pleasure" of taking them off.

Or exercising strenuously so you can have the pleasure of being in better shape later.

It's not like that at all. Smoking is effortless (unlike exercising) and leaves you far worse off (unlike exercising).

That has nothing to do with the analogy. The form of the analogy is "do something uncomfortable so that something desirable happens later."