It can be because of stress, or because they are abused at home.
It can also be peer pressure.
The speaker is using allusion it this line.
Allusion is a figure of speech in which something outside of the source text is being referred to. So here, Bacchus, Satan, and the Hangman aren't actually characters in this literary piece of work, but the author is making a reference to them nevertheless.
If i am to use a proper spelling and grammar, that sentence could be changed into :
The store, with its half roof covered in snow, was freezing to the point where the customers were visibly shaking
hope this helps
The figurative language used in the passage is a simile .
