Trauma can be a rapid gateway to addiction, but it’s not required. The brain will seek to repeat anything that brings with it a happy shot of dopamine.
What starts as normal use may evolve into unhealthy use and spiral out of control. Or it might just stay normal forever. Like everything, there’s a range. Sometimes the trauma is self-inflicted, in form of isolating and loneliness - and a self-destructive circle inwards. I have personal experience with this.