Here are some figures about what Americans currently think about 911:
38% of Americans have some doubts about the official account of 9/11, 10% do not believe it at all, and 12% are unsure about it;
46%, nearly one in two, are not aware that a third tower collapsed on 9/11. Of those who are aware of Building 7’s collapse, only 19% know the building’s name;
After seeing video footage of Building 7′s collapse:
46% are sure or suspect it was caused by controlled demolition, compared to 28% who are sure or suspect fires caused it, and 27% who don’t know;
By a margin of nearly two to one, 41% support a new investigation of Building 7′s collapse, compared to 21% who oppose it.
Data from US citizens August 2013
http://rethink911.org/news/new-poll-finds-most-americans-open-to-alternative-911-theories/