Okay kiddo, so you know how there are some things that grown-ups can do that kids can't, like drive a car or buy alcohol? Well, smoking is one of those things. It's not healthy for anyone, but adults are allowed to do it if they want to.
Now, back when smoking first became popular, there were a lot of different companies that made cigarettes. But over time, a few big companies became really successful and made most of the cigarettes that people smoked. They were called the tobacco industry.
The tobacco industry had a lot of power because so many people smoked their cigarettes. They made a lot of money selling them, but they also had to deal with a lot of criticism because smoking is bad for your health. People started to realize that smoking could cause lung cancer and other diseases, and they wanted the tobacco industry to do something about it.
But for a long time, the tobacco industry didn't want to admit that smoking was bad for you. They even tried to make it look cool and sexy, so people would keep buying their cigarettes. They put ads in magazines and on TV that showed famous people smoking, and they made it seem like smoking was something that strong, independent people did.
Eventually, though, people started to realize that smoking really was bad for you. Governments around the world started making rules to try to stop people from smoking, like putting warning labels on cigarette packs and banning smoking in public places. The tobacco industry had to change the way they did things, but they still make a lot of money from people who smoke.