They are made, but it helps if you were born smart
Yes we traders are not born but we always learn, if we will keep learning it will increase our information about trading so leads to profit and better future, being smart is surely good thing it will help you take wise decision and will help us prevent scamming and hacking, so better if we increase our knowledge and polish our skills to make ourselves good traders.
One thing we need to understand everyone doing trading cannot be successful so only the people who are doing at their best will get the job done,others will make very less or just lose everything what they have invested but yes they were made from their skills and experience.But not all the born have same IQ it might changes according with genes so it also maybe a thing to be successful.