When lead is molten, it releases minute amounts of vapors at a progressive rate as temperatures are increased. Only lower temperatures between 700-800 degrees are normally needed to cast lead hobby parts. Most melting equipment sold to hobbyists will not raise temperatures much above 900 degrees. Minimize vaporization by operating melters at the lowest temperature that gives good results. Before eating or smoking, always wash your hands after handling raw lead so that lead dust is not transferred from your hands to food or tobacco products that could be ingested.
Small children are the most lead sensitive segment of the population.
They are also inclined to put small objects in their mouths. Keep small children away from your work area. Keep you work area clean. Melting lead and casting lead objects will expose you and others in the area to lead, which is known to cause birth defects, other reproductive harm, and cancer. Lead contamination in air, in dust, and on your skin is invisible.