It has been hotly debated on the extent that substances change your behavior. Media and youth awareness campaigns would have you believe that the use of certain illicit substances will make you be on the news doing crazy things. It’s true that the only thing deemed newsworthy is if the high person does something crazy.
In most users, it would not be bad to that extent. Regardless, there is no doubt that some of these substances are very harmful and downright dangerous. Substances that remove inhibitions will exaggerate a person’s personality. If they are scumbags or violent idiots while sober, they will be even worse while high. Regardless, some of these substances will always make things worse.