@CNN: The five most addictive substances in the world: 1. Heroin 2. Cocaine 3. Nicotine 4. Barbiturates (“downers”) 5. Alcohol https://t.co/svMc2eqgRj

@CNN: The five most addictive substances in the world:

1. Heroin
2. Cocaine
3. Nicotine
4. Barbiturates (“downers”)
5. Alcohol

https://t.co/svMc2eqgRj