Addiction is a state in which a person take any substance to relief himself but with passage of time its continuation becomes damaging and compulsive.
Its effects reflects in relationships , concerns , friends , community even in environment. In short an addicted person acts as a pollutant to everything. Due to their bad behaviour their character demoralize them in community and it harms them and their surroundings.
Basically these drugs change your mind time to time and you feel relaxed but its continuation damages mind permanently and it does'nt work properly. You may have begun using drugs without any noticeable negative consequences, but as you continued to abuse drugs, the negative consequences became more apparent.