why do adults smoke and drink

I think adults smoke and drink because of what they’re going through. I’m not an adult yet but I know that they go through a lot. Any adult that has a kid, goes to school, and or is a single parent I know things can get stressful. I also know that adults like to party as well as teens. When things get stressful people like to smoke and drink. Smoking and drinking isn’t the best thing to do when you’re stressed but from my experiences I know that that’s what adults like to do. That’s why I think all adults drink and smoke.