The behaviour becomes a major priority in the person's life to the exclusion of other behaviours. Drug dependence is one such addiction, of which the most familiar is chronic tobacco use. Some drugs can produce a physical dependency when the body adapts to the presence of the drug. If the user stops taking the drug they may experience withdrawal symptoms as the body readjusts to functioning without it. People with physical dependence will develop tolerance and need more of the drug to gain the same effect.
Withdrawal syndromes differ for various drugs.
They may include irritability, nausea, sleeplessness, anxiety, vomiting, stomach cramps and last for a week or more until the drug is metabolised totally or eliminated from the body. Medication may be used to assist some withdrawal syndromes. Indian hemp, from whose fibres paper, clothing, and textiles can be made, is a non-psychoactive strain of cannabis sativa . Cannabis is presented as marijuana, hashish, or hashish oil. Hash can be added to tobacco and smoked, or eaten in foods.