I was in Florida several years ago and Florida was having wildfires. Some areas were evacuating. If a person smoked a cigarette, they were told that they couldn’t throw it on the ground or it would start a fire.
Something so small, such a small amount of smoke, could start a huge fire.
With our words, the tongue, a relatively small part of the body, can be hugely destructive if a person isn’t careful.
James uses fires as an illustration for the destruction that our words can cause. “How great a forest is set ablaze by such a small fire!” (James 3:5).