ANSWER: You can break your fast by quickly eating some snack like samosa etc to satisfy your hunger a bit and then can come back to have the full meal after salah. You must not skip salah totally until you are full! 

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ANSWER: You should politely ask him to not smoke when you’re helping him since passive smoking is dangerous. You should also give him dawah about its prohibition from time to time, with wisdom, knowledge, fair preaching and diplomacy.

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ANSWER: This is totally prohibited as the extra they will give is riba (Interest money) which is one of the major sins in Islam and Allah has waged a war against people who deal with riba 

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