Definitely. . .but it's why I avoid going much beyond the criticals, because actual fire is nasty.
I wouldn't want to get into progressive escalation, like paper, kindling and wood, you light the paper with a match, paper lights kindling, kindling lights wood. Despite the match not burning hot or long enough to ignite the wood, it can cause it.
Most "Spontaneous Human Combustion" cases turn out to be some variation of:
68 year old woman has a stroke, collapses on tile kitchen floor, cigarette lights the cuff of her shirt on fire. . .shirt fire is hot enough to start melting fat. . .melting fat soaks the ash of the burned shirt, then the still burning pants ignite the fat (like the ash wick of a colman lantern essentially), fat burns long and hot enough to get the flesh burning, flesh burns hot enough to get the bone burning.
Cops show up, find a large scorch mark with some ash in it, an oily soot stain on the ceiling and some fragments of the ends of the bones where they are densest, some shattered tooth enamel, and nothing else. (Sometimes with skinny people they just find the arms and legs, which didn't have enough fat in them to get the cycle going). . .
Much like an 18 inch thick green log, it's hard as heck to get a human body burning, but once you get it going. . .
I'd love to see an "On fire" mechanic I liked, but I've yet to see one, and the blindness from smoke, inability to breathe and poison mechanisms that would make fire real are just too ugly.
Hence, like you I mostly just stick to the critical table.