I can't believe I've overlooked this one for so long, but it appears there has been a French smooth jazz station right here in my hometown of Montreal, Canada for quite a while now.
Planete Jazz 91.9 (CKLX-FM) has been on the air since 2004, and they began as a traditional jazz format branded as Couleur Jazz 91.9. In 2008, they relaunched as Planete Jazz 91.9 with a smooth jazz format.
In addition to smooth jazz, CKLX also plays some blues music. They air a blues show called Midnight Blues, which runs from midnight to 1 AM.
For more information about Planete Jazz, check out their website (in French) at http://www.planetejazz.ca/
. They also stream online, and provide podcasting. Definitely worth adding to the list.