ADDICTIVE

[adjective]An addictive drug is one which you cannot stop taking once you have started.Narcotics such as morphine, heroin and cocaine are extremely addictive.Tobacco is highly addictive and the tobacco industry knows this.Addictive is also used of any activity or food that you cannot stop doing or eating once you have started.The problem with video games is that they're addictive.These nuts are addictive - I can't stop eating them!Someone who is described as having an addictive personality very quickly becomes addicted to drugs, activities or food.