cigarette lighter coffee pot 12V Car Heating Cup, Stainless Steel Electric Car Kettle with Plug, Portable Travel Insulated Heated Mug, Vehicle Heated Cup Mug Warmer, for Hot Water Tea Coffee Making Portable Coffee Maker for Emergency

Commenter the_cooperreyn summed up the current state in the comments section: It was for a cigarette lighter but most cars dont have that as standard anymore now its just power or optional smokers package. What Its Actually For Now The 12-volt socket is still useful for a wide range of accessories, which is why automakers have largely kept it even as USB-A and USB-C ports have taken over the everyday charging job

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Association of alpha4beta2 nicotinic receptor and heavy smoking in schizophrenia

It is caused by nicotine withdrawal and gradually lessens as your body adjusts to having no nicotine