Is death the only harm we should consider?
Children don't usually die of smoking. They can develop asthma from second hand smoke.
Or a life long addiction as an adult that does indeed put them at risk of lung disease, cancer, and more. (grandfather had oral cancer, then throat cancer, then finally lung cancer which metastasized to his brain)
I believe that device addiction at an early age puts children at higher risk of disability. That we are going to find ourselves with a generation that has a significant portion of them unable to work. We are already see children developing anxiety, depression, and eating disorders in middle and late childhood. Yet we're increasing screen time, and advertisers are ramping up the targeting of children online.
About all I have been able to do is write my representatives with my concerns. But be prepared for the future. We have let down a generation.