A thought I have is about whether smoking is superior in that it delivers directly to the lungs the nicotine. If smoke quality is good and only nicotine and what else comes from tobacco leaf is what the lungs receive, wouldn't this likely to be therapeutic?
Since we thinking of smoking as only bad without any qualification, we may be wanting to stay within the limits set by conventional wisdom.
Conventional wisdom being often, or mostly wrong, we may just be shutting ourselves off from the best solution offered in the simplest package from nature.