== Tobacco? == 

 The alleged link to tobacco use sounds pretty fishy. Better be sure somebody isn't just spreading more dishonesty about tobacco here. Nobody's arguing it's not bad for you, but it's become pretty common lately for antismokers to try to link it to anything and everything bad even if the link is inappropriate or a flat out lie. This link is questionable because, among other things, people generally don't smoke with their buttholes after anal sex.