[Hectic]

it would also depend on what brand of smoke nade u tested like i said earlyer those tactical omes they carry get too hot to hold where as in the video you see the guy hold it a good long time, i also had some that i got off of ebay befor, they wer cool to hold till about half way through the 90sec burn time but they shot out a flame/spark like a road flare or a roman candle does, it was winter time so setting fire wasnt an issue but i wouldnt wanna use those ones in the summer or fall for sure theyd ignite brush.
all of theese smoke nades will burn differently and have different designs so some will be safer then others