The quality of video is so poor, I cannot imagine how anyone thought "cigarette" to be honest. I watched it numerous times and found it rather odd where the light was coming from.
To get my bearings on where the rear vehicle stopped before it turned off it's lights:
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Then a still of that video where it shows the light
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Now a 50% transparent layer of the first image directly over the second image, to show where the light is in comparison with the tail lights of the rear vehicle
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To me, it doesn't look like the light source is coming from the vehicles at all.