org-export-with-smart-quotes is a variable defined in `ox.el'.
Its value is

Non-nil means activate smart quotes during export.
This option can also be set with the OPTIONS keyword,
e.g., "':t".

When setting this to non-nil, you need to take care of
using the correct Babel package when exporting to LaTeX.
E.g., you can load Babel for french like this:

#+LATEX_HEADER: \usepackage[french]{babel}

You can customize this variable.

This variable was introduced, or its default value was changed, in version 24.4 of Emacs.