Midnight - Associates them with darkness
Hags - old, ugly, evil looking women
So basically the full description indicates the fact that the witches are evil for what they have done and for what they will do.
He eventually changes his mind about them when they give him the predictions.
Answer:
Finn the Red–Handed had stolen a skillet and a quantity of half–cured leaf tobacco, and had also brought a few corn–cobs to make pipes with. But none of the pirates smoked or "chewed" but himself.
