because the kind of survival that our brain is trained for is short term “stay alive now and withing the next few days” kind of survival.
the goal is to keep your body fueled with energy and what ever else it needs, long term effects of things like smoking or consuming tons of alcohol are not of any consideration for the brain itself.
Not doing things that will hurt you long term requires you to make that decision and people are very bad at making decisions if the problem is far in the future.
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