As has been mentioned, smoking those store bought chemical rods called cigarettes are certainly unhealthy.
But as to whether smoking is good for us, I believe that it all depends on what you are smoking. I look at the mechanics of smoking much the same way as liquid, the substance goes into your body down your throat and absorbs within. My guess is that smoke reaches many more areas in the body directly and more rapidly then liquid.
The only question I have is whether the burning of the matter kills anything that might be beneficial during the smoking process. From my vast amounts of personal experience with the intake of smoke
, I'm leaning more to the belief that yes smoking can be beneficial to your health. But as the saying goes "watch what you eat", in the case should be "watch what you smoke".