Be careful of any appliance that smokes or has an unusual smell.  Replace it or have it repaired immediately.  Don't use frayed or cracked electrical cords or overload extension cords.  Fuse boxes should never be tampered with.

Be careful with wet or water damaged chimneys; dry them out completely, and then build small fires for the first few uses. If the chimney is not completely dry, heat from a fire can condense water into steam, which can cause damage.

Water-damaged materials should be dried and cleaned within two or three days of water removal. Waiting longer than this can cause the development of mold, which poses a health hazards. If mold has already developed, vulnerable persons, such as infants, the elderly, or those with asthma, should avoid the area while cleaning occurs.
 

Mildew is a particularly dangerous type of mold that causes damage mainly in fabrics. However, the presence of mildew and other molds can also be hazardous to your health. It can trigger cold-like symptoms as well as asthma attacks. Living in a house with high mold levels is dangerous, especially for those with upper respiratory conditions, as tiny mold spores are easily inhaled deep into the lungs.