void main()
{
if (GetLocalInt(GetNearestObjectByTag("marshgas"),"on")) return;
int x = 0;
for (x=1;x<6;x++)
{
 ApplyEffectAtLocation(DURATION_TYPE_PERMANENT,EffectAreaOfEffect(AOE_PER_FOGSTINK," "," "," "),GetLocation(GetObjectByTag("marshgas",x)));
}
SetLocalInt(GetNearestObjectByTag("marshgas"),"on",1);
}