CA Pub Res Code Section 4423.4

Outdoor smoking is not restricted or prohibited by a proclamation issued pursuant to Section 4423.1, unless specifically restricted or prohibited in that or a subsequent proclamation. If restricted by proclamation, smoking shall be confined to the following:

(a)

Within motor vehicles while operating or parked on established roads, rest stops, or parking areas cleared of flammable vegetation.

(b)

Within established campgrounds open to the public.

(c)

Within an area that is at least three feet or approximately one meter in diameter which has been cleared to mineral soil by removal of all flammable vegetation and duff.

The exempted locations may be included within the smoking ban if specifically noticed in the proclamation.