Plenty of good things about nicotine :
- weight management (appetite suppressant) [1]
- clarifies certain kinds of decision making
- heightens alertness
- improves attention for those with schizophrenia [2]
Smoking cigarettes on the other hand is... less than optimal.
[1] https://www.nih.gov/news-events/nih-research-matters/brain-p... [2] http://schizophrenia.com/nicotine.benefits.htm