I just found a September 2020 poll, by AEI, that covered LOTS of issues.
Back when a bit less than half of Americans said they would get a FDA-approved vaccine, only 20% of blacks said they would.
So that backs up my observations that most anti-vaxxers could have been from racial minorities, until recently, anyway.
There was a version of a 9/11 Truther question asked, in the poll.
It asked if the Bush administration had advanced knowledge of the specific 9/11/2001 operation , but allowed the attacks to happen.
17% said yes
51% said no
32% were not sure
(The poll could have asked whether the Taliban government was justified in not turning over bin Laden, until his accusers proved that he, as well as the other accused, were really involved in the planning and/or operation. The early statement from bin Laden emphatically denied any involvement)
(Middle easterners, in their home lands, generally feel that the later videos, of bin Laden, are fakes - or, alternatively, they feel he was always a mole pretending to oppose the foreigners who menace the Middle East, while secretly working for the enemy)
(Polls consistently show that Arab populations are majorit 9/11 Truth believing )
The poll only asked 1 question on 9/11
Poll:
Conspiracy Theories, misinformation, Covid-19, and the 2020 election.
Findings from the September 2020 American Perspectives Survey
Daniel A. Cox
(Cox does a sly little inoculation trick, when he prefaces the poll with commentary that includes a grant that the CIA had information of a "general" attack by "al Qaeda". He leaves it essentially at that)
(Perhaps a better question would have centered on the much more salient issue of whether the CIA had enough advanced information avaliable to have been able to have stopped the attack?)
(And French intelligence had evidence of bin Laden meeting CIA officials in Dubai, from June 28 to July 4, 2001, if I recall correctly)