Dr. Lawrason needs to hit up PubMed and do some research.
He says that nicotine reduces insulin levels. Smoking can do that, but...
Research says:
Acute effect of the transdermal administration of nicotine on insulin sensitivity in healthy individuals with and without a family history of type 2 diabetes mellitus in the first branch.
Acute effect of the transdermal adm... [Metab Syndr Relat Disord. 2004] - PubMed - NCBI
He says nicotine causes reduction in the oxygen supply of vital organs and blood clots (which can be indications of a stoke). Smoking can do that but...
Research indicates:
"More recent Swedish studies and an NHANES study indicate minimal if any increased risk of CVD with ST." -- Neal Benowitz
http://www.fda.gov/downloads/Drugs/NewsEvents/UCM232147.pdf
(CVD = cardiovascular disease, ST = smokeless
tobacco).
He also states that nicotine may cause certain cancers on its own. That may be true of smoking but...
Research says:
"The lack of increase in common cancers in lifelong ST users indicates that nicotine is not a general cancer promoter" Neal Benowitz
http://www.fda.gov/downloads/Drugs/NewsEvents/UCM232147.pdf
He says that nicotine can cause rapid heartbeat and increased blood pressure. Actually, that one is true; however....
The effect lasts about 20 minutes. The same can be said for exercise.