Your question is serious and, before answering, I took the time to consult with someone with more expertise.

Although the photos are not definitive, the stem appears to be hairless and it looks like the tell-tale purple splotches are starting to appear, as seen in Poison Hemlock. Had you cut the stem open and it turned out to be hollow that would have been further proof. Given what we can see in the photos, my recommendation is to assume that yes, it is Poison Hemlock. Treat it accordingly, with gloves, protective clothing, and eye protection. Remember that the toxin is absorbed through the skin. If we have misidentified it, you will only have expended a little extra time to be safe – surely worth the effort.

Here is a link to an article from Michigan State University that has a handy chart for identifying Poison Hemlock and information on how to treat and control it:

Poison hemlock identification and control - Agriculture

I found two sources that said your nearby soil or food crops will not be toxic because of the presence of the Poison Hemlock. That said, I would be very careful about the possibility of leftover Hemlock roots when harvesting root vegetables. See the quote below:

“However, even if it was poison hemlock, it will not poison your garden nor an any way affect your plants other than the competition for resources. But you wouldn't want it growing in your garden, certainly. It is essential that you remove the entire taproot and all the flowers before they can seed.” Can Poison Hemlock cause toxicity in nearby food plants? - Ask Extension