The Reynolds document cited by Farsalinos and the original data from the Poison Control Center were not confirmed deaths, but rather were reported deaths. This is a huge difference, as anyone can report a suspected cause of death to the Poison Control Center. Just because someone dies who recently consumed nicotine doesn't mean that the nicotine caused the death (or had anything to do with the death).
Same thing for reported poisonings at
Poisoning Stats
I'm also not aware of any confirmation (when the autopsy was performed) that the death of a toddler in Israel (also cited by Farsalinos) was caused by nicotine (which was reported in the news media the day of the death).
In regards to the abstract of an article in Forensic Science International at
Two UK suicides using nicotine extracted fr... [Forensic Sci Int. 2010] - PubMed - NCBI
I haven't seen the full text of the article, but some of the claims made in the abstract raise more questions than they answer.
For example, how did the two suicide victims extract the nicotine from tobacco (its not as easy as following directions on the Internet)?
And while the reported nicotine plasma level of 5.5mg/l (in one of the suicide victims) appears to be very high (and could be a lethal dose), that statement contradicts (or at least calls into question the validity of) another sentence in the abstract that "Information that nicotine was the agent responsible only became apparent some time after death." If that level of nicotine was found in the blood (presumably during an autopsy), why did it take so long for the cause of death to be attributed to nicotine?