I've been vaping for five years. I use both regular and salt nic. I have noticed that salt nicotine liquids kill my coils much faster. I have tried liquids from different manufacturers, with different salt nicotine content, at different wattages and on different devices. Salt nicotine liquids always turn my cotton and coils into a black mess within a week, while classic liquids leave almost no trace after a week of use. Has anyone experienced this? I can't find anything about it on the internet