what are some steps that people can take to avoid catching a disease from someone else or transmitting a disease

exposure to hazardous carcinogens and toxic substances can cause breathing problems, such as copd and various types of cancer. it also increases the risk of heart attacks and strokes and has serious (but no less unattractive) side effects, such as aging, yellow teeth, a terrible smell and damage to the vocal cords.

c. flammable gases, patient lying in standing water, combustible liquids near the victim