2010 Aug 1;67(8):841-9 [101] Mikael Ekblad, Liisa Lehtonen, Jyrki Korkeila, Mika Gissler, Maternal Smoking During Pregnancy and the Risk of Psychiatric Morbidity in Singleton Sibling Pairs
So consuming Hookah and Shisha come under the heading of smoking as per the definition stated above What about cigar and pipe smoking in which a person does not inhale the smoke into his lungs, rather just sucks in order to draw the smoke into his mouth
Given that smoking kills so many people who do it, the smokers who survive long enough to be at risk of Parkinsons disease might be an unusually hardy bunch, so it could be this rather than the nicotine thats protective against Parkinsons

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