  During the recent decade a steadily increasing number of papers devoted to
so-called "quantum dusty plasmas" (QDP) appeared. These systems are combining
the properties of dusty (i.e. micrometer to nanometer-sized particles
containing) plasmas with quantum effects %(of electrons) appearing at
high-density and/or low-temperature. Many exciting properties of QDP were
predicted including nontrivial collective oscillations and linear and nonlinear
waves. It was predicted that the results have relevance for dense astrophysical
plasmas such as white dwarf stars, neutron stars, magnetars and laboratory
plasmas in micro- and nano-devices. Here we present a careful examination of
the plasma parameters for the expected applications and compare them to the
conditions under which a dust particle can exist in a quantum plasma. The
conclusion is that quantum dusty plasmas do not exist in reality.
