She broke it (for the most part) by going cold turkey
Cigarette smoke contains thousands of chemicals that travel through your bloodstream and can affect your health negatively
For instance, I like the Zippos that have the business logo of companies that are in the United States that did business for the last hundred years

Nicotines Risky Health Effects Outside of the well-established risks of tobacco use, a substantial body of research has also linked nicotine, including synthetic, to a wide variety of harmful health effects, such as: Increased risk of heart attack and cardiovascular disorders Resistance to chemotherapy and higher risk of multiple cancer types Elevated risk of respiratory, gastrointestinal and kidney disorders High blood pressure Decreased immune response Negative impacts on reproductive health Long-lasting, life-threatening addiction Short-term side effects include: Irritation in the mouth and throat Abdominal pain and nausea Vomiting and diarrhea Increased blood pressure and heart rate Early symptoms of nicotine addiction, such as cravings, restlessness and insomnia Side Effects on Developing Brains Nicotine use also damages the human brain especially ones that are still developing
A standard carton contains 200 king size cigarettes, packaged as 10 packs of 20 cigarettes each