The study lasted for 21 months. If, as an example, people in the MCP decided that after 2 years, they would try the same dose as what they left off at, it could

The study lasted for 21 months. If, as an example, people in the MCP decided that after 2 years, they would try the same dose as what they left off at, it could be too high for them or laced with something new to their bodies( like Fentanyl ) and could OD/kill them.