I would say that, most of what you may think is smoke, is a legitimate concern.
To become more educated on concrete, I would suggest ASTM reference material and ACI (American Concrete Institute) and 03300 C.S.I. specifications, (Construction Specification Institute)
You can separate the aggregates, or settle them out. There is a limit to the drop distance, I think its 8'-0", from that height and beyond you need to use a chute, its common to see that in 03300 specifications.
Vibrator needs to be used in increments within a form, never still in one place, touch and go, just to settle and eliminate voids, especially a wall or similar component. You don't fill a form and then use a vibrator, you do it in increments until you reach the top of the form, or you could cause a blow out, too much settling at once, I've seen it happen.
Another seemingly obscure specification with concrete ready mix trucks, is there is a counter that tells you how many times the barrel has turned, more than 300 times and the load is rejected, can settle out the aggregate, not sure about additional air entrainment, but there is a reason for the counter and it comes from ACI or ASTM.
P.S. Never forget that this material is caustic, and will burn your skin in short order.
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