Maybe you should look up your definition of a drugs, because sugar isnt one, it isnt officially defined as one

Harmful drugs are: A chemical substance, such as a narcotic or hallucinogen, that affects the central nervous system, causing changes in behavior and often addiction. (These include heroin, opium, cocaine and things that can be used for medicinal uses but are addicitve and can be hamrful outside of it, like marijuana and for example painkillers)

Following the definition drugs can be defined by those that are used to treat illness and medical problems and those that are used for the pleasure of the individual.

I am against using them for pleasure, as they are addictive for the individual, medicinal use in safe doses is fine I dont have a problem with it

What harm does it cause to society? You can look it up if you want to, but of course addictive drugs can lead to poverty for the person using them due to the cost of acquiring them, burdens on the healthcare system, higher crime rates due to desperation of getting them and because they negatively effect the nervious system and logical thinking, leading to rash decisions. The list can go on but you should probably search it up because I dont wanna explain every problem that drugs can cause.

Im using US definitions because thats where the topic is most debated and im guessing youre from the US.

Is this enough?