This should indicate to you the amount of the drug needed to maintain a high for any length of time. And there's an equally immediate and intense crash or depression that follows the high. The higher the high, the lower the low. This depression is accompanied by a feeling of worthlessness and a craving for more of the drug. The need for the drug is really a frightening thing.
Nobody is immune to addiction.
You will only be fooling yourself thinking like that. Crack is more dangerous than many drugs because it is inhaled, giving it direct access to the bloodstream and delivering large doses of the drug to the heart and brain in a very concentrated form. The damage that occurs to the heart can cause irregular heartbeat and sudden death from heart attack. Although the risk of heart attack diminishes relatively quickly, the lung damage that occurs is not so quickly reversed. The brain's chemistry goes haywire, too, causing depression, irritability, hallucinations and violence.