Yes, as you thought, it's all complete rubbish; comprehensively debunked over at Velvet Glove, Iron Fist;
The thirdhand smoke scam
"An extended version of my article about the thirdhand smoke study is on the Free Society website today. Quick summary: they used 14 times as much nitrous acid and 15 times as much nicotine as would be found in a normal home to produce a few nanograms of a substance that isn't a carcinogen. Apart from that, great study."