[andrepd]

Funnily enough, there isn't (that is, there is some, but not so much as you would thing). https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2865193/

It's the reason I've personally ceased my "smoking when drinking" habit.

[jdsully]

That study is for “4-7 cigarettes per day”. Still quite heavy.