Neanderthals carried a gene called DRD4-7R forty thousand years ago. This gene is associated with risk taking and sensation seeking; always seeking but never satisfied.
A similar gene exists in 10% of the current human population and this 10% are more likely to be addicts. In fact, what kept humans progressing through evolution was this quest for novelty.
Entrepreneurs get us addicted to devices with constant updates and new features. Both substance (hard drugs) and behavioural (sex, shopping, etc.) addictions involve the release of dopamine - the brain's reward system.
With constant 'rushes' of dopamine, the brain decides to stop releasing dopamine, so you don't get the same buzz, and need more dopamine to get the same kick. And if you don't get it, you are left with the craving, in some cases leading to even more harmful addictions (e.g. cocaine).
Source: How to be human by Ruby Wax. Penguin Life, 2018
