According to [1] the growth in smart phone market penetration was closer to 15-20% than 40% but definitely non-negligible over that time period. I assume smartp

According to [1] the growth in smart phone market penetration was closer to 15-20% than 40% but definitely non-negligible over that time period. I assume smartphones are significantly likelier to have a battery accident than dumb cellphones due to the higher power requirements. On the other hand, iPads are definitely not that wide spread - that number is also far more strongly correlated. I'll admit I should have been more precise - I actually checked stats for several other types of devices. Given all the new wireless headphones like Airpods, all the growth in vape usage (especially cannabis vapes, which became legal and a TSA nothingburger in many states around that time), and so on, I think the burden of proof is on showing that the increase in fire exceeds the growth in number of devices. Based on personal experience, most vapes are very easy to overheat because the on button sticks out on many devices and it's the kind of thing a smoker would have in carry on. Edit: Just realized I got a separate smart phone for work in that time period. [1] https://www.pewresearch.org/internet/fact-sheet/mobile/ https://www.pewresearch.org/internet/fact-sheet/mobile/