  We apply Menke's JSJ decomposition for symplectic fillings to several
families of contact 3-manifolds. Among other results, we complete the
classification up to orientation-preserving diffeomorphism of strong symplectic
fillings of lens spaces. We show that exact symplectic fillings of contact
manifolds obtained by surgery on certain Legendrian negative cables are the
result of attaching a Weinstein 2-handle to an exact filling of a lens space.
For large families of contact structures on Seifert fibered spaces over $S^2$,
we reduce the problem of classifying exact symplectic structures to the same
problem for universally tight or canonical contact structures. Finally,
virtually overtwisted circle bundles over surfaces with genus greater than one
and negative twisting number are seen to have unique exact fillings.
