Fact is that fatwood has LOTS of turpentine in it, and SuperCedars has OIL in it (wax made from petro), etc.........
Heating oil, motor oil and similar products rarely flash. You'd have to try to do so......
Cape Cod lighters, which have been used for years....are dipped in Kerosene.
In other words, common sense is the main thing.......
Little related story - back around 1980, Kero heaters were BIG news. Everyone was buying one. So, the famous TV "consumer advocate" from Philadelphia, Herb Dennenberg, was doing a "watch out - you will kill yourself" story on them. It turned out that he was at the gas station when I went to fill up my 5 gallon can.
So, he comes over with the camera crew and starts saying "you know, fire officials say it is extremely dangerous to store that kerosene in your garage or basement, etc. etc.".....and I agree that it should not be in the basement. But, since I was already in the business, I also remarked to him that Kero and Heating oil were not very flammable in that liquid state unless really spread out, atomized, heated up, etc.
He doubted me, so I said "hey, come around back and we'll try to light up this 5 gallon can".
So, he and the camera crew and I head out to the field behind the gas station and I put the 5 gallon can down and spill a little so that it collects in a puddle on the top of the can. Now we have a puddle plus 5 gallons under it! He says "what are you going to do?"...I said I will light a wooden match stick and attempt to ignite the fluid.......
He backed the crew up and they used the zoom lens...since he did not want to be ignited. I took a number of matches...one after another, and set them right into the puddle...and, of course, they were immediately extinguished by the Kero!
Later that night I looked at his "scare the public" piece on TV...and he left out all those parts of the taping. He only had me saying not to store it in the basement.
Anyway, I understand all the cautions because understanding flash points and combustion and stuff like that are too much for the average joe, and if folks were to do it regularly, we would have some crispy critters. Rest assured that regular firewood has cooked off a lot of eyebrows too (wood gas explosions).