I know the current “heroin/opiate/fentanyl” epidemic has resulted in accidents, one can research it. So, yes, I lend credence to the story.
If one wants to talk about marijuana, I suppose it is there, I suppose states such as Washington (per Michael Medved, talk radio) has seen an increase in accidents but I would want to look at the data myself.
Honestly, I’d worry more about texters.