Recommended maximum intake of alcoholic beverages tell you that it's up to 1 drink per day for women and 2 for men.
Is there an equivalent for cigarette smoking?
Recommended maximum intake of alcoholic beverages tell you that it's up to 1 drink per day for women and 2 for men.
Is there an equivalent for cigarette smoking?
Yes
It’s zero.
See: Doll, R., & Hill, A. B. (1950). Smoking and carcinoma of the lung; preliminary report. British medical journal, 2(4682), 739–748. doi: 10.1136/bmj.2.4682.739 pubmed central: PMC2038856
And their follow up papers. And pretty much the entire medical literature on smoking.