Answer: A reason someone may want to abuse a drug could be because they were potentially pressured into it, other people around them are doing it and enjoying it, or even they could be looking for a way to cope with their emotions. Others may have even started with something such as smoking that worked as a gateway to other drugs.
Step-by-step explanation:
Everyone has different reasonings but these seem like some of the more common reasons people start from my point of view.