No shit, nicotine like all other stimulants like vyvanse or Adderall or even coffee are all vasoconstrictors. So are 5-HT2A psychs like shrooms and LSD.
The findings in nic free juice are interesting though. I'd also like it if there was a study on nicotine salts specifically.
Older vapes used freebase nicotine, quite unpleasant in high doses, like 6mg/10ml, so we vaped a lot of juice with a smaller nicotine concentration.
On the other hand nic salts are a very different ballgame, elfbars have like 24mg/10ml strength and you feel no throat hit at all. It feels "unnatural" and vibes tell me to worry.