Question

research indicates the following effects of marijuana on the iq of a heavy and sustained users who start as teenagers: there si no effect on iq. there is a temporary decline in iq. there is a temporary increase in iq. there is a permanent decline in iq.

Explanation:

Research has shown that heavy and sustained marijuana use starting in adolescence can lead to a permanent decline in IQ. The developing brain during teenage years is vulnerable to the effects of marijuana's active compounds, leading to long - term cognitive impacts.

Answer:

There is a permanent decline in IQ.