Is a chocolate addiction unhealthy if you don't pack on the pounds?

My boyfriend loves to eat chocolate. Whenever he comes home with 6 blocks of chocolate (100 grams each), 2 will be gone by the end of the evening and he won't eat dinner, because he's full with chocolate. 3 days later, everything is gone; sometimes even sooner, cause he can eat up to 4-5 blocks a day.
He tells me not to worry so much cause chocolate has health benefits, but I doubt the pros outweight the cons?

Also, is it possibly hereditary? His parents also skip dinner sometimes or eat less dinner just to be able to eat chocolate.
Is a chocolate addiction unhealthy if you don't pack on the pounds?
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