Provide a stepwise curved arrow mechanism for the following reaction. 
Definitions:
OxyContin
A brand name for oxycodone, a powerful prescription opioid pain medication that is often abused.
Cigarette Smoking
The act of inhaling and exhaling the smoke of burning tobacco encased in cigarettes, known to cause health issues including respiratory disorders and cancer.
Legal Drugs
Substances that are allowed by law for use, often including medications prescribed by medical professionals.
Illegal Drugs
Substances whose production, sale, or possession is prohibited by law due to their potential for abuse and harm.
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