Question

1. all of the following are possible effects of heroin, except:

a. false sense of well - being
b. drowsiness
c. dizziness
d. improved concentration

Explanation:

Heroin is a drug that depresses the central nervous system. Effects like a false sense of well - being, drowsiness, and dizziness are associated with heroin use. However, heroin impairs cognitive functions and does not lead to improved concentration.

Answer:

D. Improved concentration