A-ko didn't intentionally kill B-ko, it was an accident in the heat of (a rather fucked up) moment.
... Yeah I guess it could also be explained that way.
As for smoking, it isn't necessarily a sin.
I know. But isn't heaven supposed to be like... heaven? There should be no need for recreational drug use like tobacco because everyone's already happy, right?
I guess not, because that angel looks pretty exhausted from the extra work this pair of doomed lesbians created lol