Need specialist on Olfaction!

Hello guys, i've been doing a bit of research regarding olfaction and Chemotopy (Chemical nature of odorants).

I'm struggling right now trying to find which are the strongest odors for humans.

So if someone could help me out, i was wondering:

What is the cheapest and strongest odor i could find? (that is safe for humans)

PS: I am trying to inhibit ongoing panic attacks by smell (Any information can be useful)

Thanks!