You bring up great points. The study was not to say that anyone couldn't become addicted to drugs or problem gambling for any number of reasons. The study was to point out that there is a correlation between addiction and intelligence level to say that people with high intelligence levels on average have a higher statistical propensity to fall into patterns of addiction. It can happen to anyone and there are plenty of intelligent people who have no issues whatsoever, it was more just an interesting study I saw