Coffee is irritating to the stomach and bladder, especially in women. It can cause of headaches, heart palpitations, anxiety, and insomnia. Caffeine may increase the risk of heart attacks. Tea is less irritating to the stomach and contains less caffeine. Combining caffeine with sugar and fat can increase dependence.
Caffeine can be toxic if over-used, and continued use can result in addiction .
Cocaine Cocaine is derived from the Coca plant. Coca is eaten and brewed as tea. In this form it is safe. Neither coca nor cocaine are considered physically addictive , but cocaine can facilitate strong dependence . It is easy to develop a bad relationship with cocaine.