Viewing lepton mixing through the Cabibbo haze

I explore the hypothesis that the Cabibbo angle is an expansion parameter for lepton as well as quark mixing. Cabibbo effects are deviations from zero mixing for the quarks but are deviations from unknown mixings for the leptons, such that lepton mixing is veiled by a Cabibbo haze. I present a systematic classification of parametrizations and catalog the leading order effects. This phenomenological approach has practical merit both as a method for organizing top-down flavor models and as a guideline for planning future experiments.