Drug use, production, and sales pose a threat to public safety because they increase criminal activity as the desire to fulfill the addiction and make money through drug sales expands. Drug use also increases the spread of disease as individuals battling addictions often make poor judgments concerning sexual behavior, sharing needles, etc. Finally, drug distribution also increases the risk of pollution as chemicals needed to make drugs are dangerously mixed or used, creating an environmental hazard.
Sorry if this is too long but hope this helps