I'm sure everyone of them could be smashed before the first hour.

Lol - except that Nami doesn't get drunk (or at least we've never seen a quantity of alcohol great enough to get her there XP). And Zoro likewise has ridiculous alcohol-consuming abilities!

Shanks (and his crew) are a horrible influence, but I love them to bits

Mahaha - oh what would Garp say if he ever found out about the drinking game!!?!! LOL!