system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5:When people drink alcohol, cravings for and use of cigarettes is increased greatly. Is there a scientific basis for this, or is it purely habitual?
gpt
Alcohol is a depressent, nicotine is a stimulant, the two go very well together. 

Alcohol also lowers inhibition and impairs judgement, meaning you are more likely to give into a craving, and less likely to care about the implications of doing so (stinky breath, cancer, ugly looks from non smokers). 

Mixing things that slow you down, with things that speed you up, is seen in a lot of situations. 

At a certain level, smoking while drinking is a very light version of speedballing heroin with cocaine.