One summer night a decade ago, the al-Shami family was woken up by a roaring sound or rockets but it wasn't followed by the usual explosions. Instead, the family members started having difficulty breathing.
Ghiad al-Shami, 26, remembers how everyone tried to run to the rooftop of their apartment building in eastern Ghouta, a Damascus suburb that at the time was held by opposition fighters trying to topple Syrian President Bashar Assad.
