Has my ADHD been taken for granted?

Attention Deficit Hyperactivity Disorder, where does it come from? From looking at many research studies, psychologists can only say that it may be passed down genetically and that if a parent were to have it, the child is likely to as well. Is it solely based on our genes, or is it something else entirely; possibly something to do with our environment and its chemical make-up or our environment in the sense of nature versus nurture?