play KOTOR 1! Being the only KOTOR game from bioware (2 was Obsidian), you'll find that most of he references in SWTOR are to this, and there were plenty from what I saw as a Smuggler. I'd say it's recommended just so you get the full storyline goodness, as some class stories are focused on the events from it. Plus it's still a brilliant game, if you havent already played it.