NDMA is very harmful to the liver of animals and humans. People who were intentionally poisoned on one or several occasions with unknown levels of NDMA in beverage or food died of severe liver damage accompanied by internal bleeding. Animals that ate food, drank water or breathed air containing high levels of NDMA over a period of days or several weeks also developed serious, non-cancerous, liver disease. When rats, mice, hamsters, and other animals ate food, drank water, or breathed air containing lower levels of NDMA for periods more than several weeks, liver cancer and lung cancer as well non-cancerous liver damage occurred. The high level short-term and low-level long-term exposures that caused non-cancerous liver damage and/or cancer in animals also usually resulted in internal bleeding and death. Although there are no reports of NDMA causing cancer in humans, it is reasonable to expect that exposure to NDMA by eating, drinking, or breathing could cause cancer in humans. Mice that were fed NDMA during pregnancy had offspring that were born dead or died shortly after birth. However, it is not known whether NDMA could cause the death of human babies whose mothers are exposed during pregnancy. It should be realized that exposure to NDMA does not mean that any effect on health will definitely occur.^source