Ava is a recovering alcoholic. Her previous use and life as an addict is mentioned mulitple times and there's one particular scene where she looks into a mini bar and focusses on the mini alcohol bottles. She eventually takes a bottle of water.
Ava attends an Alcoholics Anonymous meeting and describes some events from her life while using.
Some smoking
Many people drink alcoholic drinks around a recovering alcoholic
An alcoholic requests a double whisky at a bar, smells it but then walks away.
It's sugggested the main character also had a drug problem, as it's mentioned she was found with a needle between her toes.