Full Idea
At no point (in Sect VII of 'Enquiries') does Hume even hint at the thesis that there is (or even might be) no such thing as causation.
Gist of Idea
Hume never even suggests that there is no such thing as causation
Source
report of David Hume (Enquiry Conc Human Understanding [1748], VII) by Galen Strawson - The Secret Connexion 21.3
Book Reference
Strawson,Galen: 'The Secret Connexion' [OUP 1992], p.214
A Reaction
If, as some people think, Hume is a phenomenalist, then we wouldn't expect him to actually deny the existence of such things. The standard position (cf. Ayer on religion) is that such things are not even worth mentioning.