“All addiction is based on the same craving for a dopamine response, whether it's drug, gambling, alcohol or phone addiction,” he says. “As the dopamine response drops off, you need to increase the amount you need to get the same result, you want a little bit more next time. Neurologically, they all look the same.“We know – there are lots of studies on this – that once we form an addiction to something, we become more vulnerable to other addictions. That’s why there’s concerns around heavy users of more benign, easily-accessed drugs like alcohol and marijuana as there’s some correlation with usage of more physically addictive drugs like heroin, and neurological responses are the same.”