Only the females that draw blood are attracted to CO2 (carbon dioxide). Now the females and males hatch together and fly around together, the problem with attracting them by vaping I suspect is indeed sweet flavors. The male mosquito's only source of food is nectar from plants, it is the only thing they feed on. So if the males are attracted by the vape the females may follow being they are in the area and need the males for....well ya know.
Yellow jackets. They are in some ways a lot like hummingbirds in that they need both carbs and protein. If putting out traps provide both meat and liquid. They do need more protein while tending a hatched nest and that's when they get real aggressive around food and will swarm an area, other wise they tend to go to both protein and liquid traps.
A trap can also create more problems by luring more yellow jackets to your area, it's a balance that only the property owner can decide. Also a trap that allows some to escape is a good idea, the will return to the nest and bring all their friends back with them for an easy meal there by trapping more and more of the dirty bxxxxxxs.
I'll always take the chance that I draw Yellowjackets from the surrounding area. The more that drown in my trap, the fewer I will encounter when I run the lawn mower over a nest in the ground. Once, while using a bagger on the back of my mower, I stopped to empty the grass clipping in a part of the yard where I was using clippings to control a wash. As I dumped the bags on the bank I felt a sting, then another sting, then a bunch of stings. They can sting more than once. I was in a swarm that had been sucked up through the mower blades and into the bag. They couldn't leave with the pressure of air on the top. When I dumped it, yellowjackets were everywhere!
I used to get a 4 inch layer of dead ones in a trap and that's good. Those aren't flying around and reproducing. I won't completely rid the yard, but I'll put a dent in the numbers. When I see them flying, the traps go out. These days, I don't get so many in the traps and that tells me it's working or they have moved to another location.
If I see a few out hunting for food, I hang the trap where they are frequently spotted, although anywhere in the back yard where sun can warm the apple juice is a good place for action. They'll find it.
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