Why does my vape coil burn out so quickly?

I have a Smok AL85. I recently bought it and within a month and a half I went through the 2 coils it came with. My buddy has had the bigger version of my vape for 5 months now and is still on his first coil (i received the same coils as him), and it's not burned or black anywhere AND he uses it on 70 watts when... show more I have a Smok AL85. I recently bought it and within a month and a half I went through the 2 coils it came with. My buddy has had the bigger version of my vape for 5 months now and is still on his first coil (i received the same coils as him), and it's not burned or black anywhere AND he uses it on 70 watts when it says on the coil you shouldn't go over 35-40 and I only go to 32W because it tasted burnt when I go to 40. We also have the same tank (baby beast) and he uses his vape way more than I do. Why is my coil burning out so fast? Is it the size of my vape causing it or what?
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