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Aim: To map the prevalence of smok ing among patients with narcolepsy-cataplexy (NC), narcolepsy without cataplexy (N) and idiopathic hypersomnia (IH) and verify whether smok ing prevalence in NC patients is higher than in N and IH patients in Central Europe. Methods: We asked 172 adult patients about smok ing (111 of them with NC, 37 with N and 24 with IH) us ing our own structured question naire dur ing their outpatient examination or dur ing phone interview. Results: Daily smokers represented 46.8% in the NC group, 18.9% in N and 12.5% in the IH group. The prevalence of smok ing in the N and IH group together is 16.4%, i.e. signifi cantly lower than the prevalence in the NC group (p = 0.0006, two-sided Fisher test). Conclusion: The prevalence of daily smok ing among patients with NC is more than twice as high as in the Czech general adult population (18%), and higher than smok ing prevalence among N and IH patients together. [ABSTRACT FROM AUTHOR]