Yes, the causes are mainly genetic, but you can't diagnose it based on genetics, instead it's diagnosed based on symptoms. So if environmental factors (like giving toddler a tablet) worsen it already in childhood, the chances of getting ADHD diagnosis increases, in particular for milder cases. It's impossible to fully know what is caused by genetics, and what is caused by environment.
There is also something called "Attention Deficit Trait", which is case of ADHD like symptoms where the cause is not in genetics, but solely in environmental factors. While real ADHD is largely in genetics, I fully believe any individual can mess up their dopamine system by spending enough time browsing social media on their smartphone.
Most people who get ADHD diagnosis do have the condition (assuming proper diagnosis procedures were followed), but in a different environment it could probably be much less of an issue for many.
There is also something called "Attention Deficit Trait", which is case of ADHD like symptoms where the cause is not in genetics, but solely in environmental factors. While real ADHD is largely in genetics, I fully believe any individual can mess up their dopamine system by spending enough time browsing social media on their smartphone.
Most people who get ADHD diagnosis do have the condition (assuming proper diagnosis procedures were followed), but in a different environment it could probably be much less of an issue for many.