How high is too high humidity???

So just chopped my first two babies ever . Both autos . Got them hanging in my grow tent and was wondering how high is too high of humidity for drying that I have to worry about mold growing? I have a fan going in there and my carbon filter going but the humidity is already at low 70s and I'm scared its going to get higher.

I also kept my trim in a cardboard box and left that in the tent too. Is that what's bringing it up so high ?

Any tips to bring the humidity down ? Without buying a fucking dehumidifier

Also trimming is a bitch!!!! Lol took me over 2 hours and I know I did a shitty job cause I was in a rush . The smell was getting me paranoid

Congrats on first harvest!!! Obvious answer is to get a dehumidifier. They aren't cheap but they work.

HOw large is the room the tent sits in. If small, maybe get some of the Rid Damp things people use in basements. With the exhaust going, not much you can do in the tent. So you need to dry up the air going into it.

It actually has fallen to mid 60s now. Looks like I'll be fine the tents a 2x2x4