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.
Worldwide, alcohol and nicotine are the commonest sources of addiction. Other drugs associated with addiction are opiates (morphine), psycho-stimulants (cocaine, amphetamine, methamphetamine), marijuana and phencyclidine. The effects of some of these drugs are given below. Addicting drugs activate the parts of brain associated with reward feelings.