Only moderator of the forum the thread is in and admins can edit threads.
The only way other people users can change a poll is if you have left it open for others to add topics. If this happens it is fairly likely other users will add in inappropriate comments in which the thread will either be a) locked b) edited and locked for new poll topics c) the entire thread deleted.
Also it is common that if you are posting lots of Polls that are "which wheels should I get" or "which body kit", these will likely be turned into a normal thread by a moderator or admin. Polls are really only supposed to be for big issues that actually require the readers of the forum to vote on something.
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