And we seek out those other things too; sex and food for example, both of which can also be unhealthy. Heck, even video games too.
Anything that we enjoy causes our brains to release dopamine which makes us feel good, conditioning us to repeat the behaviour.
Of course we're conditioned to repeat behaviors.
I'm just saying, drugs are unnecessary since there are safer ways to seek out pleasure rather than consuming something toxic like a drug that will have worse effects than over consumption of food or over usage of video games. Consuming drugs cause way more issues long term.