Everyone who has tried something new has felt at least once "more energy" and "focused“ no matter what they tried. This is your body's response to novelty and stress. It's called habituation and stress response. By the way, people feel more energetic just before they die. Blow makes you feel more energetic too so I’ve heard. 

 You talk by theories you make up in your mind, and you can make an infinite amount of them all with some sense. 

To have a real opinion on anything you need to experiment it. Try it 3 months, then you can talk, Are you afraid? 

 Every theory is made up in a mind. 

How is your opinion on suicide btw?