if (mons_corpse_effect( mon->type ) == CE_POISONOUS
        || mon->type == MONS_GIANT_ANT
        || mon->type == MONS_SMALL_SNAKE
        || mon->type == MONS_SNAKE
        || mon->type == MONS_JELLYFISH
        || mon->type == MONS_SWAMP_DRAKE
        || mons_is_mimic( mon->type ))
    {

    if (is_mons_poisoner(mon))

    }

bool is_mons_poisoner(monsters *mon);

bool is_mons_poisoner(monsters *mons)
{
    if (mons_corpse_effect(mons->type) == CE_POISONOUS)
        return true;
    const int attk_flavour = mons_attack_spec(mons, 0).flavour;
    return (attk_flavour == AF_POISON
        || attk_flavour == AF_POISON_NASTY
        || attk_flavour == AF_POISON_MEDIUM
        || attk_flavour == AF_POISON_STRONG
        || attk_flavour == AF_POISON_STR);
}

    3, 11, MST_SWAMP_DRAKE, CE_CONTAMINATED, Z_SMALL, S_ROAR, I_ANIMAL,

    3, 11, MST_SWAMP_DRAKE, CE_POISONOUS, Z_SMALL, S_ROAR, I_ANIMAL,