Even though the percentage of people with Attention Deficit Hyperactivity Disorder is likely the same as in the past, there are three likely reasons why it seems that "there is more ADHD" than ever before:
First, we become more aware of problems like this as parents than we were as a children. We have grown up now and we are more concerned about these issues since we have our own children.
Second, the news and entertainment media have talked about Attention Deficit Hyperactivity Disorder a lot more than in the past, raising our awareness levels.
Third, a recent study by the National Institute of Drug Abuse reported that 5.5% of women REPORTED using illicit drugs while they were pregnant; 18.8% REPORTED using alcohol, and 20.4% REPORTED using tobacco while pregnant. Children who were Drug Exposed in utero, or Fetal Alcohol Syndrome children, have many of the same problems as children with Attention Deficit Hyperactivity Disorder, and are often misdiagnosed by physicians as being ADHD.