TL;DR: The fastest algorithm looks at every element once, keeping track of the largest one seen so far. Details. Intuition tells us that any correct algorithm must look at every element in the array, that's why we can't do better. Let's find an actual proof.
Drugs are addictive  because they either mimic or stimulate the production of brain chemicals that cause feelings of pleasure. After a period of time, your brain adjusts to the higher levels of the chemicals, and it becomes necessary to use more drugs to get the same effect.
What is Addiction? When a drug user can't stop taking a drug even if he wants to, it's called addiction. The urge is too strong to control, even if you know the drug is causing harm. When people start taking drugs, they don't plan to get addicted. They like how the drug makes them feel.