Answer:
She is experiencing an addiction process.
Explanation:
Addiction is an acquired mental and physical health disorder that is characterized by periodic or permanent compulsion to perform a particular activity or use of a psychoactive chemical.
The addictive process is characterized by the gradual acquisition of a dependence. Thus, it begins with a mild dose and gradually increases to generate a constant dependence on the addictive object in question. In Kristen's case, she started smoking a few cigarettes a day, but ended up multiplying by six that amount, due to the dependency that she generated.
