Substation First Year Level 1 Practice Test

Researchers believe the use of which may weaken the immune system and aggravate infections?

Alcohol Caffeine Cocaine Marijuana

Correct Answer:

Marijuana

Explanation:

The immune system can be affected by substances, and some drugs may weaken its defenses, making infections harder to fight. Marijuana is the one most consistently linked to immune modulation because cannabinoids interact with receptors on immune cells, which can dampen immune signaling. This can slow the activity of T-cells, macrophages, and natural killer cells, leading to a weaker response and potentially more severe infections. The other options don’t have as clear or direct a link to immunosuppression in typical use: heavy alcohol use can impair immunity, caffeine generally doesn’t suppress immune function at normal doses, and cocaine’s health effects are more about acute toxicity and vascular/neurological issues than direct immune suppression.

Access more questions from this quiz

Continue to Substation First Year Level 1 Practice Test for more practice questions and the full quiz experience.

Access More Questions