UMON
The "UMON" ("Usage Monitor") Base Effect is a hard-coded effect which tracks the consumption of addictive Ingestibles. When included in the effects of Ingestible which has an Addiction Chance and an Addiction Actor Effect, it allows repeated usage of the Ingestible to increase the odds of addiction.
The related game setting is fAddictionUsageMonitorThreshold with a default value of 70.0000, though the exact addiction formula is still unknown. A dead reckoning guess suggests that the setting limits the default addiction chance of any UMON Ingestible to a maximum of 70% regardless of the frequency of ingestion.