When the body gets acclimatized to some habit-forming substances, there can be adverse consequences when they are not consumed regularly. The unpleasant feelings associated with cessation of consumption are notably severe regarding heroinAn opioid used as a recreational drug that is often injected. It has a euphoric effect on the user and is highly addictive both psychologically and physically. It is known for being one of the primary drugs involved in opioid overdoses and for its particularly nasty withdrawal symptoms. More and alcoholAn organic compound used in many products, most notably intoxicating drinks. Alcohol addiction is known as alcoholism. The first 12-step program was devised to deal with that malady. More. They can even be fatal without the provision of medical attention.
Read more about substance withdrawal at withdrawalinfo.org.