Final answer:
Stephanie is most likely using methamphetamines, which are known for causing severe psychological effects such as mood swings, paranoia, and anger. Repeated use alters brain chemistry, leading to compulsive behaviors to try to regain a normal state.
Step-by-step explanation:
Stephanie is likely using methamphetamines, a class of powerful stimulant drugs. These substances are known to cause a range of intense psychological effects, including severe mood swings, paranoid jealousy, and uncontrollable bursts of anger. Opiates, on the other hand, are typically associated with a reduction in the perception of pain and can induce feelings of euphoria but are less likely to cause the severe mood disturbances Stephanie is experiencing. Methamphetamine use can lead to psychological withdrawal symptoms such as anxiety, depression, and paranoia, which could explain Stephanie's emotional instability. The drug's impact on neurotransmitters like dopamine can drastically alter mood and behavior, often resulting in the symptoms described.
Drug abuse and addiction to psychoactive substances like methamphetamines is a serious health concern, as users often struggle to stop using the drug. When the drug is repeatedly used, normal brain functioning is altered, sometimes resulting in compulsive drug-seeking behaviors to reestablish the individual's physical and psychological pre-use baseline.