Forest fires raging through Laos, Myanmar and Thailand have smothered large areas in dangerous smoke, leaving overstretched firefighters battling blazes and smog-choked communities looking to the skies for rain and their governments to fix a scourge that worsens each year.Dry season fires have brought a public health crisis to northern Thailand, including Chiang Mai, as well as much of Laos and eastern Myanmar, as parched bush provides tinderbox conditions for wildfires.Some fires are also due...