Complete shot in the dark but my brain can't let it be (also fuck it, thats the point of this topic):

Surfactants, specifically modern soap and soap products. I strongly suspect that petroleum based soaps cause damage and issues.

When you wash your glasses in a dishwasher, pour some water in after it is dried. Look at how many bubbles are formed on the surface. Pour it out and do it again - usually there will be less bubbles. That means you are ingesting leftover detergent that wasn't rinsed off. Can't be great for you.

Aspartame, apparently

It feels like the WHO - or more realistically - the media is/was trying hard to make aspartame this by claiming it causes cancer. They're certainly annoying the soft drinks vendors using them.

Great avatar btw.

Most Vegetable and seed oils. They are a silent killer and they are in everything now including French fries to replace beef tallow.

There's hardly a processed food that does not contain them and they are terrible for cardiovascular health.

Along with the fake sugars and sugar substitutes they will be among the things we will look back on and ask why.

Coffee, I think. People think coffee help you stay awake and boost your productivity.

But I think, coffee put you into unnecessary stress (stress while sitting still ? Is it natural ?), Disruption sleep pattern,...

Will cause lot of issues if you keep consume few cup daily

vapes

Sugar

Literally everything to do with modern life.

I'm not saying that we should all pull a BSG and give it all up to be cavemen again.

But our bodies most certainly didn't evolve in order to sit at desks, stare at screens, communicate without physical contact, and avoid sunshine like the plague.

We evolved to be active, but developed the technology that allows most of us to be sedentary 99% of the time, and then we wonder why obesity and chronic back pain are pandemics.

We've known lead is bad for you for thousands of years.

The internet

Perhaps microplastic? I know it already kills by choking turtles or so but no answer yet if it can cause some health effects.

Edit: Just saw the comments now seem to be the most common comments. So here is another go, The chemical they used in cars I think it's VOC/ also known as new car smell currently it can make some people sea sick. Right now there is lack of study that it is toxic.

SOCIAL MEDIA

Blue light.

cell phones/screens