Do you have a source for the first assertion? I can't find any studies on google.

I'm skeptical because people so often attribute many of the negative effects of other chemicals in tobacco to nicotine with no evidence (a point the OP hammers home at https://www.gwern.net/Nicotine). Even the FDA seems comfortable with this conflation, as evidenced by their disposition toward e-cigs.

Perhaps, and I wouldn't know from first hand experience trying it myself, but I imagine it is almost guaranteed to be safer than smoking. For reference on that matter, my mother passed away a while back from lung cancer induced by smoking (small cell lung cancer).