We all want to be sharp and intelligent as long as we live, don’t we? The effects of aging -- from forgetfulness to memory loss -- affect us all, yet we all want to stay young forever. And not just look young. We want to stay sharp and alert, even in old age. In fact, our constant search for better brain power and cognitive functioning has given birth to a new industry – and it’s called the smart drugs industry, which is worth about $2 billion (as of 2015). Before we talk about the best nootropics & cognitive enhancers let's look what are smart drugs in general.