The dilemma for anyone (in the right) wanting to report a neighbour is that it may be frightfully easy for them to work out that ir was you.
Or, equally, they could guess wrongly and your action starts a feud which never even existed previously, between them and some other neighbour, or inflames whichever neighbour relationship is already the most tense.
If you go ahead, we may, at the very least, learn where the council draws the line between "within the home" and "in a public place". The property boundary? The door frame? The front/rear step? The edge of the patio? The balcony? (blocks of flats)
Any kind of exposure of children to smoke, inside a car, has already been outlawed, if I understand correctly. The Englishman's (gender neutral) home is his (ditto) castle is still sacrosanct, so authorities are only able to "recommend" that we do not fumigate our own children.