@kennethamy,
He does have have his opponents, but I have not yet heard his criticism of causality refuted.... That doesn't mean it hasn't been. If anyone knows a good counter to Hume on this, let me know. It's a fascinating subject..
But Hume does open a crack in our notions of determinism. To call Nature's tendencies "laws" becomes more explicitly metaphorical. We impose an interpretation because it serves us somehow, either practically or emotionally. The concept of natural law may even trace back to Spinoza. The laws of nature are the mind of God, that sort of thing.