Freaky sight

I was just driving down the freeway after dropping a co-worker off at the airport, and saw a JAL (or ANA) flight coming in for a landing with smoke (?) streaming out of one of the left-side engines. That was damn freaky. I assume it was smoke, at least… we have low clouds here today, but the color of what was obscuring the back half of the plane was slightly darker and definitely more turbulent.
Freaky freaky. I assume it must be okay though, or we would be reading about it in the headlines. Yikes.