As a Canadian citizen and resident, what clarification is required. I am entering my own country declaring or not, the goods I have or have not brought with me, what other information is required and why?

If I refuse to tell you anymore, besides being sent to secondary what can you do?

If answering further questions for clarification I state that I was tending my opium field in a country that allows such things, or I was shagging the prime minister's wife in another, does it affect the duty I pay (I didn't bring the opium into Canada), does it stop you from allowing me to enter my own country?