Please help docs! where do these smoking urges come from after 16 months of quitting?

They can come back: Even after years. I quit smoking 33 years ago, and up to about 10 years ago still had vivid dreams about smoking. It can be triggered by almost anything. The same thing can happen to people with every kind of drug problem, from alcohol to opiates to cocaine. Drug dreams, sudden cravings can come and go. Unless they become really persistent and troubling, i wouldn't worry much about them.