Its a terrible feeling when you get that letter through the door... I know exactly how you feel. I had over an ounce of mushies from Europe seized this year. Thankfully just a warning was given. But I'd be lying if I said I didn't shit myself.
No, just a letter from customs, no warnings or threats, dont think its worth their time for smaller amounts, I only ever worry that my address could have a mark beside it but dont even think that happens