Drug addiction results from adaptations in specific brain neurons caused by repeated exposure to a drug of abuse. (semanticscholar.org)
Genetic or environmental influences, rather than prenatal exposure to the drugs, may have a greater influence on whether a child will develop these disorders. (sciencenews.org)
Thus far, such side effects seen in clinical trials have been minor, but it sometimes takes years of exposure to a drug before deadly infections show up, he says. (scientificamerican.com)