i experimented with mdma, adderall, lsd, weed, alcohol, and cigarettes because of peer pressure, but i have only used them a few times, and i am not addicted to any of them. fortunately, i do not have a predisposition to addiction, so my brain did not continue to crave these substances after i stopped using them. i do not have to exert willpower since i do not have the compulsion to use these substances.
ultimately, whether or not one becomes addicted to a substance they try is determined by genetics and is a matter of chance. it is worth noting that if my brain had been wired differently, i could have easily become addicted to these substances. addiction is a complex disease, and genetics plays a significant role in determining one's susceptibility to addiction.