There are a wide variety of terms that can trigger the filter.
We have several docs in the knowledge base with the current list of terms that are blocked, see also: Why is my message being blocked by a cannabis filter?
If the account is not affiliated with or does not deal in any prohibitive content, then the "Cannabis Filter" can be turned off from within the client admin of the Master Account.
Step 1.
Log-in to the master reseller account and click Client Admin.
Step 2.
Click the edit icon for the account in question.
Step 3.
Locate the cannabis filter at the top of the Account Profile settings > then Toggle the Cannabis Filter off.