Smith's past his peak, this is how you'd normally expect most players to fare against Jadeja. This isn't the second time they're playing in a series btw, first was back in 2013 when Jadeja was a rookie!
For me Jadeja is the difference between India being just great at home or virtually unbeatable, I posted some stats about W/L with him playing for India in India/Asia & he're some more -
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Which is to say that Jadeja takes more top order/crucial wickets than any other spinner. You may no agree with the exact ranking but surely he's picked crucial wickets as often as possible! Even in 2013 he made Clarke, who was in great form, look like a tailender at times. Similarly the likes of Faf, Amla &
AB in 2015 at home. The one big chink in his armor is the away record & somewhat inability to cleanup the tail.