It most certainly is smoke.
That's three now, Thought extinct ... but with us today.
It does not matter what you think it matters what these 5 people saw and corroborated. It is not the end of the world, Organ, but you are blind. Now use your ears and listen to the video 5 witnesses from 4 locations
Bowers | | Saw some "unusual occurrence", probably visual ("flash of light or smoke") in "that area" (the opening between the pergola and the east end of the fence, about where a black couple reportedly ran from). Bowers said he saw no one behind the fence. | | Holland | | Holland's line-of-sight coincides with the back of the retaining wall, where a black couple reportedly ran from, and is similar to what Bowers reported. | Dodd | | Same line-of-sight as Holland. | | Simmons | | Similar line-of-sight as Holland, but Simmons originally said he "saw exhaust fumes of smoke near the embankment in front of the Texas School Book Depository Building." | | Olivier | | |
I guess we're not going to hear from Hudson and Sitzman, who were feet from the fence corner, who reported no rifle being fired so near them, saw no smoke and detected no smell of a gun having been fired.