If Hume’s account is intended to be epistemic, then the Problem of induction can be seen as taking Hume’s insights about our impressions of necessity to an extreme but reasonable conclusion. If it is true that constant conjunction (with or without the added component of mental determination) represents the totality of the content we can assign to our concept of causation, then we lose any claim to robust metaphysical necessity. But once this is lost, we also sacrifice our only rational grounding of causal inference. Our experience of constant conjunction only provides a projectivist necessity, but a projectivist necessity does not provide any obvious form of accurate predictive power. Hence, if we limit causation to the content provided by the two definitions, we cannot use this weak necessity to justify the Principle of the Uniformity of Nature and therefore cannot ground predictions. We are therefore left in a position of inductive skepticism which denies knowledge beyond memory and what is present to the senses. By limiting causation to constant conjunction, we are incapable of grounding causal inference; hence Humean inductive skepticism.