Poison breath leaves a trail of poison gas clouds

Original patch by L

doc/fixes36.1

@@ -97,6 +97,7 @@ make commands that accept a count prefix for item selection
 allow picking a used inventory letter from menu when #adjusting
 zapping wand of opening at yourself, unlock carried boxes
 dissolve iron bars by force-fighting with wielded potion of acid
+poison breath leaves a trail of poison gas
 
 
 Platform- and/or Interface-Specific Fixes

src/zap.c

@@ -4312,6 +4312,10 @@ short exploding_wand_typ;
         }
         break; /* ZT_COLD */
 
+    case ZT_POISON_GAS:
+        (void) create_gas_cloud(x, y, 1, 8);
+        break;
+
     case ZT_ACID:
         if (lev->typ == IRONBARS) {
             if ((lev->wall_info & W_NONDIGGABLE) != 0) {