(Reuters) - Altria Inc took another $4 billion charge on its investment in Juul Labs Inc and said it had reworked its deal terms with the embattled e-cigarette maker, which is facing increased regulatory scrutiny amid a backlash against vaping.The Marlboro maker said on Thursday the fourth-quarter charge was mainly for the increased number of legal cases pending against Juul and the expectation that the number will grow.Overall, Altria has recorded $8.6 billion in impairment charges after it..