Apparently, spontaneous combustion was much more common 200 years ago than it is now. Because we found an article from 1799 with six risk factors listed by scientists that supposedly make you more likely to burst into flames:
#1.) You're older . . . especially if you're over 60.
#2.) You're overweight.
#3.) You're inactive.
#4.) You're an alcoholic.
#5.) You're a WOMAN. Yes, apparently you're more likely to randomly burst into flames if you're female.
#6.) And you're more likely to spontaneously combust in the WINTER than in the summer.