  We consider a combined system of Euler--Korteweg and Euler--Poisson equations
with friction and exponential pressure with exponent $\gamma > 1$. We show the
existence of dissipative measure-valued solutions in the cases of repulsive and
attractive potential in Euler--Poisson system. The latter case requires
additional restriction on $\gamma$. Furthermore in case of $\gamma \geq 2$ we
show that the strong solutions to the Cahn--Hillard--Keller--Segel system are a
high-friction limit of the dissipative measure-valued solutions to
Euler--Korteweg--Poisson equations.
