Question

sold under names like k2 or spice, this substance may cause heart attacks and other health problems.
methamphetamines
synthetic marijuana
lsd
another name applied to hallucinogens is *
psychedelics.
lysergic acid diethylamide.
\speed\

Explanation:

• First question: Synthetic marijuana is often sold under names like K2 or Spice and can cause heart attacks and other health problems. Methamphetamines are stimulants with different effects (e.g., increased energy, euphoria), and LSD is a hallucinogen with distinct psychological effects (e.g., visual and auditory hallucinations) rather than being commonly associated with these specific trade - names and health issues.
• Second question: Hallucinogens are also known as psychedelics. Lysergic acid diethylamide (LSD) is a specific type of hallucinogen, not a general name for the class. "Speed" is a slang term for stimulants like amphetamines, not hallucinogens.

Answer:

• First question: synthetic marijuana
• Second question: psychedelics