Final answer:
Yes, the effects of LSD can occur long after the drug has been taken due to the possibility of experiencing flashbacks or Hallucinogen Persisting Perception Disorder (HPPD).
Step-by-step explanation:
The statement that the effects of LSD can occur long after the drug has been taken is true. LSD, also known as acid, is a potent hallucinogenic drug that can cause a variety of sensory and emotional effects, including hallucinations and altered perceptions. Classic Hallucinogens like LSD are known for their long-lasting impact on mood and perception. Users may experience flashbacks, or Hallucinogen Persisting Perception Disorder (HPPD), where they re-experience aspects of a previous LSD trip without warning long after taking the drug.