Outbreak - is Onionhead the cause?

The past two weeks have seen the drug Onionhead being spread far and wide across the Federation. Seen by the politicians as a social malaise, contained forcefully by the military, and as the livelihood of the farmers of Kappa Fornacis. It is a continuing source of escapism by the young.

But that doesn't stop Onionhead being what it is: an alien plant.

Taken recreationally rather than medicinally is there room for Onionhead to bring longer term side effects that are only now starting to emerge?

CMDR Charybdis responded to a medical emergency mission in Tau Ceti last night, one that contained an outbreak. A mission that required agri-medicines to contain.

An outbreak of... what, exactly?