This problem has become a major public hazard in the world today? Answer: drugs.

3. Which of the following substances belongs to drugs? Answer: poppy shell.

4. What does ice belong to? Answer: Doping.

5, long-term smoking opium will make people lose? Answer: immunity.

Extended data:

There are many kinds and ranges of drugs, and the classification methods are different.

From the source of drugs, it can be divided into three categories: natural drugs, semi-synthetic drugs and synthetic drugs. Natural drugs are drugs extracted directly from drug plants, such as opium. Semi-synthetic drugs are synthesized from natural drugs and chemicals, such as * * *. Synthetic drugs are made entirely by organic synthesis, such as methamphetamine.

According to the effect of drugs on human central nervous system, they can be divided into inhibitors, stimulants and hallucinogens. Inhibitors can inhibit the central nervous system and have sedative and relaxing effects, such as opium. Stimulants can stimulate the central nervous system and make people excited, such as amphetamine. Hallucinogens can make people hallucinate, leading to self-distortion and split thinking, such as mescaline.