>>12651921No, they are neurotransmitters that have multiple tasks like artery dilation, something in the intestines, motor control, mood regulation, etc. they are a part of the finely balanced homeostasis of the body.
dopamine and serotonin themselves are added to your system in very rare specific cases, all drugs that change mood just alter something in their cycle which fucks the balance and leads to problems. human happiness is psychological and comes from experiences which can't be replicated.