[quote=@Muttonhawk]
Their presence'll be a bit dangerous if their narcotic effect doesn't have any physiological drawbacks (apart from wanting to go do it again). The reason I say this is because there'll be a competitive edge to any population on sweethearts. That'll eventually spread to become the norm and then -- poof! -- every mortal on Galbar is a depraved, superintelligent nihilist. Probably not my favourite prospect, to be honest. What you've basically made is coffee except it's far stronger and it affects people's personal morals and ethics.

I saw that you included the way it escalates into foods but I'm not sure if that'll really be enough of a buffer.

Could I recommend something like...say...off the top of my head...motor-neuron damage as a long-term side affect? Like, after one month of heavy use?
[/quote]

Good call! We don't want these guys to be everywhere.

A weak 'buffer' could be scarcity, maybe some three or four doses per two-year sweetheart, though that's hardly interesting to read. I could beat the dead horse a little further on their hearts theme. After too many uses, the same substances that allow them to integrate into a host as a larva messes with circulation, threatening cardiac arrest or haemorrhage- Especially if they keep abusing the mental rush, and their head keeps pounding for more oxygen.

Keep 'em coming, guys, I don't want to work out this idea's myriad kinks and flaws on my own. I'm a lazy bastard.