Coffee and cigarettes are correlated primarily due to genetics

[Plazma Inferno!]

Smoking and caffeine consumption show a strong positive correlation, but the mechanism underlying this association is unclear.
The largest ever twin study of its kind combined with GWAS data and a separate longitudinal twin study shows that smoking and caffeine use are correlated primarily due to genetics, not environment or causality. Also, study indicates that genetic factors may make quitting smoking more difficult for heavy caffeine drinkers.

https://meta.science/paper/27027469...ption_a_genetic_analysis_of_their_association

 

[iceaura]

They're both stimulants. Am I the only one not startled by this?

My drugs are all zips - I'll never be an alcoholic, or barbiturate abuser, but I had to ration the cigars even when they were cheap. And I had enough sense to just never fool with amphetamines or cocaine. I recall Paul Erdos quoted as saying, after he voluntarily abstained from speed for a month on a bet (to prove he could), that the experiment had set back mathematics by thirty days - he became an "ordinary person" with no ideas. I know how he felt.