Well, not the Surgeon General (a.k.a. Doctor Who?) actually, but Rogier van Bakel over at the always-innerestin' and informative blog Nobody's Business.
Van Bakel charges uber-blogger Eugene Volokh with making "a piss-poor argument" on the topic of public-sphere smoking vs. urination:
Even the usually sane law professor Eugene Volokh has his off-days–such as when he wonders if smoking on the street isn't just as bad as peeing on the street. "Both smoking and urine creates smells that many people find offensive," Volokh writes, and then he entertains the idea that maybe smoking outdoors should be banned, analogous to public urination. Is he playing devil's advocate? Here's hoping.
Van Bakel, channeling the likes of James Dean, Richard Gere, and Billy Carter, argues that public urination and public smoking are two very different beasts, writing in part, "Public urination necessitates exposing oneself (an arrestable offense). Smokers, by and large, manage to keep it in their pants."
More, including links to the original Volokh post and much, much more, here.