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Which is the most addictive substance in the world?

The Opiates is what i will consider as the most addictive substance in the world ....

Opiates are often the most addictive actually because the body do become physically so dependent on the substance after some few weeks of an actual consistent use which is (two to three weeks for heroin).

well Other substances do have many negative effects on a person but none of them do really often have this same quick effect on a person.

That is why many people who are addicted to heroin/opiate do often go into a withdrawal (drug sickness) when they do not actually keep ingesting the drug....the person actually starts to really go into withdrawal for about 24 hours after the last dose, and also the physical sickness often do last up to three or four weeks if the addict was actually a heavy user...