Answer:
The only time when you can be legally "high" due to drugs is when you're in a serious situation that needs serious medication. This is usually the alternative to some other affliction that diminishes the negative effects of the drug. Otherwise, you can become naturally "high" by producing your own neurotransmitters and hormones rather than taking in artificial chemicals in the form of pills, injections, smoke, etc. You can do this by simply doing what you enjoy-- what makes you happy.