The short-term effects of heroin abuse appear soon after a single dose and disappear in a few hours. After an injection of heroin, the user reports feeling a surge of euphoria (rush) accompanied by a warm flushing of the skin, a dry mouth, and heavy extremities. Following this initial euphoria, the user goes on the nod, an alternately wakeful and drowsy state. Mental functioning becomes clouded due to the depression of the central nervous system.
Long-term effects of heroin appear after repeated use for some period of time. Chronic users may develop collapsed veins, infection of the heart lining and valves, abscesses, cellulitis, and liver disease. Pulmonary complications, including various types of pneumonia, may result from the poor health condition of the abuser, as well as from heroin’s depressing effects on respiration.

A study of college students has shown that critical skills related to attention, memory, and learning are impaired among people who use marijuana heavily, even after discontinuing its use for at least 24 hours. Researchers compared 65 heavy users, who had smoked marijuana a median of 29 of the past 30 days, and 64 light users, who had smoked a median of 1 of the past 30 days. After a closely monitored 19- to 24-hour period of abstinence from marijuana and other illicit drugs and alcohol, the undergraduates were given several standard tests measuring aspects of attention, memory, and learning.

Methamphetamine is taken orally or intranasally (snorting the powder), by intravenous injection, and by smoking. Immediately after smoking or intravenous injection, the methamphetamine user experiences an intense sensation, called a rush or flash, that lasts only a few minutes and is described as extremely pleasurable. Oral or intranasal use produces euphoria – a high, but not a rush. Users may become addicted quickly, and use it with increasing frequency and in increasing doses.
كانت صدمة كبيرة لي ولأهلي. شعرت أني أخذت صفعة على وجهي لكي أستيقظ من هذه الحياة وهذا الوهم. لم أصدق نفسي إنه يتم التحقيق معي، وأني معرض للسجن لمدة ليست قصيرة، وضياع مستقبلي. والدي فعل المستحيل لكي ينقذني من هذة القضية ونجح في ذلك. بعد هذه التجربة أخذت قراراً مع نفسي إني لن أعود لهذه الحياة مرة أخرى، ولن أقوم بهذه الأشياء مرة أخرى، وسوف أترك هذه الصحبة، وسوف ألتفت إلى مستقبلي ودراستي.

Nicotine is highly addictive. It is both a stimulant and a sedative to the central nervous system. The ingestion of nicotine results in an almost immediate kick because it causes a discharge of epinephrine from the adrenal cortex. This stimulates the central nervous system, and other endocrine glands, which causes a sudden release of glucose. Stimulation is then followed by depression and fatigue, leading the abuser to seek more nicotine. Nicotine is absorbed readily from tobacco smoke in the lungs, and it does not matter whether the tobacco smoke is from cigarettes, cigars, or pipes.

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تتيح بيوت إعادة التأهيل من خلال برامج مثل الإقامة الكاملة للرجال، الإقامة الكاملة للإناث، وبرامج أخرى، العديد من الميزات التى تُسهم بشكل فاعل فى خروج النتائج العلاجية فى صورتها المطلوبة، حيث تضمن لك هذه البرامج عدم التعرض بشكل أو بأخر لنفس البيئة أو التعرض للأشخاص أو العيش بالأماكن التى كانت سببًا فى الادمان وتفاقم المشكلة، لكن البيئة العلاجية التى توفرها لك تلك البرامج، تضمن لك أفضل نتيجة يحتاجها مريض قرر العلاج ثم التعافي ثم الخروج للمجتمع من جديد.
Environmental factors such as the availability of marijuana, expectations about how the drug would affect them, the influence of friends and social contacts, and other factors that differentiate identical twins’ experiences also were found to have an important effect; however, it also was discovered that the twins’ shared or family environment before age 18 had no detectable influence on their response to marijuana.