because it has some kind of poison in it that is very bad for you. That's why they don't make led pencils any more they use graphite instead.
Yes the lead that is burned along with the fuel is a harmful poison.
harmful affects of lead are that it causes headache ,cancer and in last brain damage
Cholera is harmful; it causes severe diarrhea which may lead to dehydration and death.
some are harmful but some are not harmful
Paint can be harmful to us due to the presence of volatile organic compounds (VOCs) which can be released into the air, leading to indoor air pollution. Some paints may also contain heavy metals like lead, which can be toxic if ingested or inhaled. Prolonged exposure to paint fumes can lead to respiratory issues, headaches, and dizziness.
because you can die from it
obesity is harmful to us because it causes many diseases
well its harmful to your computure
no it is not harmful to us
Mercury & lead.
appetite lossabdominal painconstipationfatiguesleeplessnessirritabilityheadache
The ozone layer protects us from the sun's harmful radiation.