Using the potentials derived from vector-meson-exchanges, the KK̅, DK, BK̅, DD̅, BB̅, BD, D̅ K, BK and BD̅ systems are studied. Possible S-wave bound-states of two pseudoscalar mesons are discussed. We find that systems of DB, DD̅, BB̅ and DK with isospin 0 are likely to form S-wave bound states via strong interactions while the others are unlikely to be bound by the strong interaction sector alone. With the Coulomb potential, the K^+K^- system can form an atomic bound state - the kaonium. The

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... nfluence of the one-meson-exchange potential on the ground state energy of the kaonium and its decay widths to ππ and πη are evaluated.