I find drug abuse has become a major threat to humanity. Being one of the causes of crime, causing disorder and security, degeneration of the race, human dignity, undermining of family happiness, affecting health and especially infectious diseases. transmission of HIV / AIDS in the community; Consequences and harms caused by drug addicts cause serious impacts on economic development, threatening the stability, prosperity and longevity of each nation and each ethnic group. what's your opinion 
If these drugs are used continuously will eliminate our appetite. Can lead to lack of dopamine or loss of body coordination eventually nerve impulses can not proceed to the next nerve cell.
May cause a weakened heartbeat.
Loss of muscle control and liver damage, and stomach.
Nervous system disorders, such as sedatives, decrease brain activation. Stimulants are feeling strong despite not sleeping, Halusinogen the emergence of fantasy or hallucinations.
Damage to the respiratory apparatus, shaking continuously and may even lead to death.