There are a variety of reasons individuals experiment or become addicted to drugs, such as: social history, genetic disposition, use by friends and/or family members, income level, how the individual handles stress, etc. A list from most addictive to least addictive substances include:
1) Heroin – the most addictive substance. Users often feel intense drug cravings and withdraw when denied this substance.
2) Crack Cocaine – crack is the most potent form of cocaine. Due to the fact that the high lasts approximately 15 minutes, it leads to repeated use which speeds up the onset of addiction.