  In heavy ion collisions after the quark-gluon plasma there is a hadronic gas
phase. Using effective Lagrangians we study the interactions of charmed mesons
which lead to $J/\psi$ production and absorption in this gas. We update and
extend previous calculations introducing strange meson interactions and also
including the interactions mediated by the recently measured exotic charmonium
resonances $Z(3900)$ and $Z(4025)$. These resonances open new reaction channels
for the $J/\psi$, which could potentially lead to changes in its multiplicity.
We compute the $J/\psi$ production cross section in processes such as
$D_{(s)}^{(*)} + \bar{D}^{(*)} \to J/\psi + (\pi, \rho, K, K^{\ast})$ and also
the $J/\psi$ absorption cross section in the corresponding inverse processes.
Using the obtained cross sections as input to solve the rate equation, we
conclude that the interactions in the hadron gas phase do not significantly
affect the $J/\Psi$ abundance. In other words, there is neither a charmonium
suppression nor charmonium regeneration from light mesons in the hadronic
phase.
