Totally. They may wander up bad river, strung out looking for another hit - SNAP! Killed by a bear. My fellow Salmon, please talk to your roe about the dangers of drugs.

Whether it is or is not, is not a function of the cocaine though, but rather idiosyncrasies of the wider ecologies the salmon are in.

If roaming more widely introduces them to more productive food opportunities (or, lower predation) than their closer ecology, then it would be beneficial for them. If it does not, then it wouldn't be. Neither context is determined in the basic finding that cocaine causes them to roam more widely.

They’re in a better mood though.

I think another study is in order examining how cocaine affects breeding habits.