I think they're stupid when used for anything other than helping smokers quit, where they're good for weening off nicotine, and provide the habit of holding a cigarette.
People who smoke them as if they are cigarettes are stupid. Just because you're cutting out the tar from a regular cigarette it doesn't make you any better when you're still just feeding an addiction.
Furthermore people who start smoking for the first time and use them are naive and idiotic for thinking it's good idea to get hooked on a highly addictive drug just because it's no longer in a cigarette.