:fart: Farting while siting at the dinner table. It´s a harmfull habit, and very umpleasent for those around him. :fart:
Picking your nose is also a nasty habit. Even worst is lying. A pathological liar is a sight to behold...
Farting in bed, reading in the bathroom, leaving the toillete seat down, bla bla bla yadda yadda yadda!


But If you mean an addiction, then i would say drugs, definitely.

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"Quincitilius Varus, give me back my legions!"
Emperor Augustus of Rome.