It's okay to use marijuana as long as you're not a chronic user. Occasional use can lead to frequent use. Because sniffing powdered heroin doesn't require needles, it isn't very risky. Heroin is dangerous no matter how it's ingested. Once addicted to heroin, users may eventually switch to injecting the drug because it's cheaper.
Drug use is extremely unpredictable and affects people differently.
Anyone can become addicted to drugs. And motor vehicle crashes are a major cause of death in the United States for youth ages 13 through 19. Children who begin drinking alcohol before the age of 15 are four times more likely to develop alcoholism in adulthood than those children who do not begin consuming alcohol until the legal age of 21. Adolescent drinking is associated with risky sexual behaviours that can lead to AIDS, sexually transmitted diseases and unintended pregnancies. Alcohol contributes to academic failure and dropping out of school.