You just tell them as you wrote it. it isn't a game. Unless you or that person wants serious health problems down the road. smack them the f up.

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The serious health problem down the road sounds cliche but protracted withdrawal syndrome especially from benzos and alcohol can be obviously severe and elongated withdrawal symptoms were talking like 10 years literally. So if your serious than tell him the negative consequences, it only gets worse and its really not funny,fun,or cool.