As the average size of families have gotten smaller, the social cost of having children has remained constant even though families have fewer children. This means that the social cost per child has risen substantially. Nowadays, you have child seats and drop-off/pickup rules for kids at school. When I was a kid, we'd stuff our 5 kids + 2 parents into a Gremlin hatchback; nowadays, with child-seats, you couldn't legally fit more than 2 kids and 2 parents into a car that size. Also, I walked 3/4 of a mile home after morning kindergarten ended (I can prove it on Google maps). My kids went to an elementary school that was less than 2 blocks away, and until they were in the fifth grade they weren't allowed to walk to school alone.
None of this would be a big deal to me, except that I've got 5 kids. We drive large cars that can fit all of the child seats, resulting in substantially less mileage and higher maintenance costs. Having to coordinate drop-off and pickup at multiple schools for 5 kids is also a lot crazier than coordinating for 2 kids.
Anyway, back to the topic at hand: Kids are a lot more durable than parents with only 1 or 2 kids give them credit for. They used to raise children in caves way back when, and if they'd had proper notions of sanitation they'd have had mortality rates comparable to ours. You don't have the treat you're kids like they're delicate, unique snowflakes. Because they aren't.
Animal dander can cause allergic reactions in kids, and if it does, you don't announce to all parents that they can't have pets around kids. If vaping irritates your kid, then don't vape around her.
Happy Meals are going to be a lot worse for your kids than anything they get from vaping. (Kids can have allergies to ingredients in Happy Meals, too.)