I'm right handed, but write from right to left (Hebrew). Smudging is not an issue with any ink, I don't drag my hand over written text. I don't know why people do that.

I usually use Pilot inks, I currently have a dark blue that I've added a touch of old green to. I absolutely love it.

For other left-handers out there, Pigma Micron pens from Sakura are outstanding. They aren't fountain pens, but their archival quick-dry ink doesn't smudge at all when writing with the left hand. They come in varying weights, and I tend to prefer the 05s or 08s. Lots of arts and crafts stores stock them.

I'll def be looking around. I have some bottled ink already, but this is a huge concern. Hopefully the fine tip has decent portion control. That helps a lot.

Noodler's has some left-hand friendly fountain pen inks.