Final answer:
ADHD is a neurodevelopmental disorder with symptoms including working memory and attention issues and impulse control. It is prevalent and commonly diagnosed in early childhood but affects individuals of all ages.
Step-by-step explanation:
Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by a range of symptoms such as problems with working memory, inhibition, selective attention, and impulse control. While ADHD is not exclusively a product of maternal smoking and substance abuse, these factors may contribute to its risk.
It is commonly diagnosed in children around the age of 3-7 years, but can be found in individuals of all ages. ADHD is indeed one of the most widely diagnosed childhood disorders in the United States. Beyond these symptoms, children and adults with ADHD may also struggle with comorbid conditions such as depression or obsessive-compulsive disorder (OCD).