The lack of oxygen can affect the baby's growth. Not all chemical exposures affect reproduction, but it is best to minimize exposure to all toxic substances during pregnancy. When Health Effects Will Occur Immediate health effects happen right away. They can occur directly at the site of contact or elsewhere in the body. For example, inhaled ammonia can irritate the linings of the nose, throat and lungs.
Alcohol can cause dizziness.
Immediate health effects are sometimes reversible and may disappear soon after the exposure stops. Delayed health effects may take months or years to appear and can result from either acute or chronic exposure to a toxic substance. The delay between the exposure and the appearance of health effects is called the latency period. Delayed health effects can be reversible or permanent. Permanent effects don't go away when the exposure stops.