Generally yes, the exception is if you are using the GE machine in US precleararance in a Canadian airport. You can use your NEXUS card in the GE machine in that case.
https://help.cbp.gov/app/answers/det...al-information

I am Canadian. I have Nexus and Global Entry.

I have a Nexus card.

When I enter the United States at YVR, I put my Canadian passport and fingerprints into the GE machine. I then hand my passport, boarding pass and GE receipt to the officer for the questioning. Should I be using my Nexus card instead of my passport?

Nexus machine entering Canada is my Nexus card, as you say.

If your Canadian passport works, I wouldn't be concerned. I use my USA passport (my only citizenship is USA) at Canadian airport Preclearance location GE kiosks. The only times I pull my NEXUS card out is entering Canada, entering USA via vehicle, and accessing the NEXUS security lines. You can use the NEXUS card to enter USA at Canadian airport Preclearance, but I'd say stick with what works, especially as you'd have to use the passport to use Global Entry kiosks at air points of entry that aren't Canadian airport Preclearance.

NEXUS card only works at pre clearance Canadian airports to the U.S. Most likely immigration officer demands to see your passport.

There's no requirement to use the NEXUS card at US CBP Canadian Preclearance or explicit benefit to doing so. It's just an option.
The machine readable zone (bottom of passport book bio page) was beat to hell and unreadable, so using the NEXUS card was quicker than hitting the button to type my document number. (It also is generally quicker for the GE Kiosk to recognize than the bottom of a passport with a good MRZ and easier to feed into the scanner quickly).

My advice to anyone is to carry the NEXUS card and enrolled NEXUS document (USA/CAN passport or LPR card from either country) even when going through airports. I've been asked to see it to get access to GE kiosks both at preclearance and the US (with the airport employees refusing access without) and asked to see both documents by a customs official a number of times (regardless of the document I picked at check-in - NEXUS card is technically valid for US <---> Canadian international flights without passport, but practically very hard to achieve due to lack of knowledge on part of airline employees/security screening staff/airport employees/US & Canadian customs).

Absolutely agree. I also carry my passport at all times for international travel. Since I'm not a US or Canadian citizen, the NEXUS card is not an approved WHTI document in my case (although the green card is.) And I require my passport to enter Canada. So I carry all three documents whenever I cross a border.

My confusion wasn't regarding what to carry, but which document to actually scan in the kiosks when entering Canada by air, which I haven't attempted before. Your summary was very helpful in clearing that up; thanks for the writeup!

You can use either. The NEXUS card gets me through security, US Immigration at YVR transborder, and onto the plane. Passport is zipped up in my carryon. I don't see the point of having to dig it out and use it at the GE kiosk when I can just leave it in my carryon and use the NEXUS card that is already in my pocket.

I don't like to take my passport out any more than I need to. If it gets lost or damaged it's quite a hassle and expense to get it replaced, especially while traveling. A lost NEXUS card is not a big deal, it's easily replaced.

The CBP GE/NEXUS kiosks at YUL can operated with no documents. It allows for name and DOB lookup followed by the the usual GE kiosk fingerprint/photo/questions process.

But then again all passengers are interviewed by CBP shortly thereafter so I'm not sure what happens if you show up with only a GE kiosk receipt and no documents.

GE in general (not just at YUL) allows you to use name/date of birth or document number (passport, green card, etc.) lookup. I used the latter extensively at airports in the past couple years because the machine readable zone at the bottom of my passport bio page was so beat up the scanner didn't read it easily.

At YUL in particular you wouldn't get through customs (at least not easily) without a document because they always interview at YUL CBP Preclearance and they want to see the passport + NEXUS + GE slip and sometimes the boarding pass as well (if they don't ask for it initially, they will if you respond to having checked baggage).

At YYZ you could theoretically clear GE without a document because they almost never stop GE members. The general behavior is if GE slip is normal (no X or O) and you don't have any checked baggage, that you walk straight through the booth without talking to a primary CBP officer and hand the one near the end of the customs hall your receipt without stopping. If you have checked baggage, then you just see a primary officer to scan your boarding pass to make sure the baggage system took pictures of all your checked bags (if not, you get sent back to an international connections baggage area to wait until your bag is found and imaged, then you reenter CBP without going through security screening again). However, there are exceptions - I did get questioned and asked for documents a couple times with normal GE Kiosk receipts at YYZ T1.

This is all kind of "in theory" though. In practice, you'd find it hard to board an international flight to or from the US without a passport or NEXUS card (with many gate agents not recognizing that the latter is valid for US <---> Canada transborder travel in lieu of a passport), and with no documentation you would find it difficult to get through security screening at the US Transborder gates in Canada to even reach the CBP Preclearance hall.

I just got my NEXUS card. I had the misfortune of having to go to an interview. I went to Montréal, where I was grilled for over an hour not about my trip to Cuba, but about my run for public office, and about some of my family members. The agent was feverishly taking notes. Despite this, I was approved within minutes from the conclusion of my interview, and I received my card five days later.

The Canadians definitely don't care about your trip to Cuba. Heck, people were checking in for the Cubana nonstop YUL-HAV after I finished with my NEXUS interview at YUL :D.

CBP doesn’t care about travel to Cuba unless person is US citizen or US LPR.

The Canadians didn't even interview me. Just the Americans.

I am a US citizen, and I've read about some of the nightmarish stories on here. I didn't get any of that.

NEXUS daily commuters secondary inspection
 

Does anyone have experience crossing Canada USA border everyday for work using NEXUS pass? Like residing in Canada and working in USA
Is it a feasible option to choose? Are US officers okay with daily commuting using NEXUS?
How frequent does Nexus commuters get to go through secondary inspection?