So what seems at first to be a mysterious phenomenon actually turns out to have a plausible explanation: A woman last seen sitting alone in a flammable chair, wearing flammable clothes, smoking a cigarette after taking a dose (perhaps a double dose) of sleeping pills.
In fact, fire deaths caused by cigarettes igniting clothing, furniture and upholstery are very common. The victim's clothes can act as a wick, drawing the body's fat to fuel the fire. Scientific experiments using animal carcasses have proven this effect.
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There are other reasons to be skeptical that random people can spontaneously combust. Not only is there no plausible medical or physiological mechanism by which a person could generate enough heat to catch fire, but there exists no film or video evidence of it ever occurring.
If it's true, as many claim, that there are hundreds or thousands of SHC cases (the Daily Mail piece claims that "a number of unexplained cases are reported each year around the world"), why isn't there any surveillance camera or cell phone footage of a pedestrian in Times Square, at a football game, or anywhere else, suddenly bursting into flames?