Now I see that YitzchokM said that he is done with the topic. I sincerely hope this is just rhetoric, since we are supposedly having a rational, dispassionate debate, and, as shown in my previous post, he is absolutely wrong to assume that the question of whether it is permitted to smoke in public depends solely on the issue of whether it is permitted to smoke at all.
In any case, I’m not sure I agree that “you can’t be a Rodef if it’s Halachicly okay.” After all, the Gemara says clearly that Pinchas was a Rodef, and Zimri would have been within his rights to kill Pinchas, whose actions were most certainly Halachicly okay. A fetus in utero can also be considered a Rodef, despite not having done anything that is not Halachicly okay.