It'd be interesting if tobacco could be safer, but isn't, because the manufacturers don't want to incur the expense and anti-tobacco folks want to keep people from smoking at all, not make it safer (c.f. vaping, which is — I think — basically harmless and yet is banned as much as smoking is).
> The most harmful cancer-causing substances in smokeless tobacco are tobacco-specific nitrosamines.
> Cancers linked to the use of smokeless tobacco include:
* Mouth, tongue, cheek, and gum cancer
* Cancer in the esophagus
* Pancreatic cancer
If there were a way to make tobacco healthy, I think the manufacturers would have spared no expense to do so, because the death of a customer prevents them from spending more money on what is sold.
(No idea about anti-vaping people, though.)
https://scholar.google.com/scholar?q=swedish%20snus
The Lancet article is good, but there's a universal consensus.
I can't imagine that cigarettes would work with steamed leaves.
edit: And you'd have to vape the steamed leaf cigarettes, of course.