I may be the last one to know this, but just in case:

"Acute nicotine administration stimulates prolactin release (Wilkins et
al., 1982; Rasmussen, 1995). However, serum prolactin levels are
significantly lower in both male and female chronic smokers who smoke more
than 10 cigarettes per day (Andersen et al., 1984). This apparent
discrepancy could be explained by a similar mechanism to that with ACTH
(Fuxe et al., 1989)."

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