Nicotine is actually one of the most addictive substance we know of! That being said, cigarettes are not something that people tend to be addicted to in the same... ferocity, let's say, that harder drugs such as heroine entail.
And while I appreciate the concern, it's really much less of an issue than you might imagine. I live in a fairly safe area with my backyard not visible by anyone who is not an immediate neighbor, and the people who take butts to relight are unlikely to be willing to intensively surveil relatively inaccessible areas, properly identify the plant, know how to cure the leaves (and have the patience for it), and then grind them up, and also be able to obtain rolling papers but not loose tobacco cans (which are almost always furnished in the same store). The ROI just isn't there.
And if they do, I'm out a plant and not much else. But I appreciate you thinking of my safety!