1.   An exhaust system inhales vapors from cleaning solvents.

2.   Its toxins are so deadly that people who merely inhale its vapors can be hurt badly.

3.   Metallic mercury, the kind the teen-agers found and played with here, enters the blood when vapors given off by the heavy liquid are inhaled.

4.   Consuming small amounts of of methyl alcohol or repeatedly inhaling the vapor may cause blindness.

5.   The greatest hazard is inhaling the vapor.