It was only a12 month probation for smoking marijuana

Misdemeanor? You could get the same sentence you would have gotten if you had not been placed on probation, you could get additional time, you could get a warning and stay on probation.

Where and what is your criminal record?

How is it being revoked, what is the reason, is there another crime you are charged with ?

You can get up to the max 12 months depending on why.