Final answer:
Stopping the use of amphetamine-like nasal decongestants can result in nasal stuffiness due to a rebound effect as the body adjusts to the absence of the medication.
Step-by-step explanation:
Discontinuation of amphetamine-like drugs used to treat nasal congestion can produce nasal stuffiness. This occurs because the body can develop a dependence on these drugs, including ones like phenylephrine and pseudoephedrine found in many cold medications. When these drugs are stopped, there can be a rebound effect resulting in symptoms such as congestion. This is different from the euphoric effects that some of the amphetamine-like drugs can provide, which is sought after in misuse scenarios. Also, the stimulant effects of these drugs can contribute to changes in neurotransmitter levels, which, when halted, can lead to withdrawal symptoms like stuffiness or congestion.