How can i get the kind of focus and productivity on a daily basis without the aid of a potentially addictive drug?

Relax your human: Eat healthy foods, get regular exercise, get proper sleep, have healthy outlets, take breaks. Drink plenty of water. If feeling excessive fatigue see your doctor. Spend time with friends and family. What can make drugs addictive is the perception that they can make you superhuman, but if your were to become addicted you would be anything but.