Anonymous:
I don't see glee going there, having Finn use drugs or something like that it's too dark for their show.. maybe alcohol or something but also given Cory's past I think it's too much

Cory’s very open about it, though. 

And they were filming this episode when Cory tweeted about how proud of his show he was.  I think Cory has no problems with going to that place.

But, no, I do not see Finn actually trying drugs.