> I would guess that adding range hoods is more expensive than switching everyone to electric stoves.

Doesn't this depend critically on what percent of gas stove owners have hoods? If 75% do, then you'd have to "fix" 3x as many kitchens if your operation is replacing stoves versus adding ventilation. If only 20% have hoods, then it could make more sense to swap the stoves. But even this doesn't make sense if the article is correct and there is not evidence of gas being worse.