I read about is earlier, and the summing up by the judge, social workers, medical staff etc all said the same thing, really: the parents weren't able to prioritise the child's health, safety and wellbeing and this was why he was taken away.
The constant smoking around him was one of the ways they failed to protect him. But there were other serious failings - serious drug use in the home, and a generally filthy and unsafe environment.
The headlines never tell the whole story.