Hey Mya,
They certainly CAN do it, but unless you show that you still consider yourself to be a JW, they aren't supposed to come after you, ala witchhunt. Do you still attend meetings now and then? If so, that would be enough for them to consider you a target.
Do they have anything on you? Two witnesses to the smoking, that kinda thing?
They can DF you without meeting with you, but they would likely try to contact you first and TRY to meet with you. If you refuse to go, they'll DF you.
Good luck! And thanks for posting!
Dave