You're almost there.

Now see if you can figure out why self-destructive choices can be rational at times?

Can you formulate a hypothetical where smoking is a rational decision? I can.

> self-destructive choices can be rational at times

It's not a rational choice. It's choosing to make the irrational choice.

A drug addict choosing to shoot up isn't making the rational choice. It's a choice we can examine on why they made that choice, but it wasn't reason that drove them to make that choice.

Thinking Trump is the anointed one isn't a rational decision. Voting for Trump to get rid of corruption isn't a rational choice. Voting for a rapist in the middle of a big pedophile ring isn't the rational choice at fighting the pedophiles.