People who try cocaine often get hooked to the short-term cocaine effects, namely feeling as though they have increased energy. The quick high keeps users feeling energetic and able to endure longer in physical activities. New cocaine users often try cocaine to increase productivity at work and in other areas of their lives so that they can work longer and harder. While these results may seem promising in the beginning, increased tolerance and dangerous life choices often follow repeated cocaine cocaine effect, appetite suppression, is very popular for people looking to lose weight or maintain a low weight. Fashion models have been known to use cocaine in order to stay thin. Cocaine users often go days without eating and if this behavior is continued it can lead to addiction. Increased heart rate, blood pressure, constricted blood vessels, dilated pupils, and increased temperature are all short-term physiological cocaine effects. When taken in large quantities, cocaine will intensify the user’s high and may cause violent and erratic behavior on the part of the user.
Radon is a naturally occurring radioactive gas resulting from the decay of uranium-238, which concentrates in enclosed spaces such as buildings and underground mines, particularly in early uranium mines where it sometimes became a significant hazard before the problem was understood and controlled by increased ventilation. Radon has decay products that are short-lived alpha emitters and deposit on surfaces in the respiratory tract during the passage of breathing air. At high radon levels, this can cause an increased risk of lung cancer, particularly for smokers. (Smoking itself has a very much greater lung cancer effect than radon.) People everywhere are typically exposed to around mSv/yr, and often up to 3 mSv/yr, due to radon (mainly from inhalation in their homes) without apparent ill-effect d . Where deemed necessary, radon levels in buildings and mines can be controlled by ventilation, and measures can be taken in new constructions to prevent radon from entering buildings.