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If it doesn't smell like gas, I would suspect that you are seeing oil. Either spilled from the fill cap or from a leaking valve cover. You will know if your valve cover leaks. The smoke and smell will drive you crazy.
Maybe a valve cover isn't a consumable on most engines. But I'm now on my third one with my N54. So they do need to be changed every 5 years or so.
I've never had problems with coils or plugs, except when I had a valve cover leaking oil onto them. BMW purists kind of look down their nose, but I'm running Autozone coils and they work just fine for me. I like them because they have a rubber coating the full length. All other coils seem to have just a rubber boot on the end that fuses to the plugs and becomes a nightmare preventing you from extracting the plugs down in the small plug wells.
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