It is impermissible to pay the Zakah for settling the debt of the deceased since Zakah is paid to eligible recipients who are alive. As for the debts of the deceased, they are to be settled from the estate before dividing it amongst the heirs, but if the deceased didn`t leave an estate, then it is desirable for his/her heirs to settle those debts if they can afford them.

What is the ruling on smoking?

All Perfect Praise is due to Allah, The Lord of The Worlds

Smoking is forbidden (Haram) since it is harmful to one`s health as confirmed by trustful physicians, and Islam has forbidden taking anything that causes harm. The Prophet (PBUH) said: "There should be neither harm nor reciprocated harm." [Ibn Majah and Ahmad]. And Allah Knows Best.

Is Zakah due on the orphan`s money?

Yes, Zakah is due on the money of the orphan.

What is the ruling on exchanging kisses and hugs between husband and wife during the day in Ramadan?

Praise be to Allah the Lord of the Worlds. It is disliked to kiss one`s wife during the day in Ramadan, and it is recommended to avoid that. And Allah the Almighty knows best.