  We suggest that decay properties (branching ratios) of hadronic resonances
may become modified in strong external magnetic field. The behavior of $K^{\pm
*}\!$, $K^{0*}$ vector mesons as well as $\Lambda^*(1520)$ and $\Xi^{0*}$
baryonic states is considered in static fields $10^{13}$-\,$10^{15}$ T. In
particular, $n=0$ Landau level energy increase of charged particles in the
external magnetic field, and the interaction of hadron magnetic moments with
the field is taken into account. We suggest that enhanced yield of dileptons
and photons from $\rho^0(770)$ mesons may occur if strong decay channel $\rho^0
\rightarrow \pi^+\pi^-$ is significantly suppressed. CP - violating
$\pi^+\pi^-$ decays of pseudoscalar $\eta_c$ and $\eta(547)$ mesons in the
magnetic field are discussed, and superpositions of quarkonium states
$\eta_{c,b}$ and $\chi_{c,b}(nP)$ with $\Psi(nS), \Upsilon(nS)$ mesons in the
external field are considered.
