What the correct option? Or maybe the of is optional? Example:
What was a little more (of) smoke going to do?
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If the thing that is going to help is a single noun, with or without an adjective, then you don't need of e.g. a little love, a little cold water, a little help etc.
But if it is more complicated than that you will need of e.g. a little of his love, a little of that water, a little of my mother's help, etc.