My understanding is that the floor on fire is not high, it seems to be on the second or third floor, why wait for rescue? The casualties of jumping directly are not so big, yesterday's casualty data was 39 people,

My understanding is that the floor where the fire caught fire is not high, it seems to be on the second or third floor, why wait for rescue? The casualties are not so big when they jump directly, yesterday's casualty figure was 39, today it has become 45, which is too sad.

Later, when it was discovered that the fire was on fire, a large amount of smoke was suddenly generated, causing the person to be unconscious within a few seconds, and there was no time to escape even for a few seconds.

Why does the current material produce a lot of smoke as soon as it catches fire? Is there a problem with this building material?