18. Cannabis use can lower verbal contribution. True False

## Step 1<br />The problem presents a statement about the effects of cannabis use on verbal contribution. The statement is that cannabis use can lower verbal contribution.<br />## Step 2<br />To solve this problem, we need to understand the effects of cannabis on the brain. Research has shown that cannabis can have a negative impact on cognitive abilities, including verbal contribution.<br />## Step 3<br />Based on the research, it is reasonable to conclude that the statement is true.