An individual experiencing anxiety, tachycardia, and sweating may be undergoing withdrawal from which substance?

An individual experiencing anxiety, tachycardia, and sweating is likely undergoing withdrawal from alcohol. This is consistent with the symptoms seen during alcohol withdrawal syndrome, which can manifest after a person who is dependent on alcohol significantly reduces or stops their intake.

Alcohol withdrawal symptoms typically include a range of physical and psychological effects. Anxiety is a common psychological response, while tachycardia (increased heart rate) and sweating are physiological symptoms associated with the autonomic nervous system's response during withdrawal.

The severity of these symptoms can vary, and in some cases, they may escalate to more severe complications such as delirium tremens, which includes confusion, tremors, and severe autonomic instability. Recognizing these symptoms is crucial for proper intervention and treatment.

Other substances listed, such as cocaine, cannabis, and hallucinogens, have different withdrawal profiles and symptoms that do not typically include the combination of anxiety, tachycardia, and sweating seen in alcohol withdrawal. For instance, withdrawal from cocaine may present with fatigue and depressive symptoms rather than the physical signs associated with alcohol withdrawal. Thus, the context provided by the question points clearly to alcohol as the substance involved.