Is the consumption of caffeine considered unlawful (haram), especially since it is an alkaloid substance belonging to the same group as nicotine and cocaine, and excessive consumption of it may lead to anxiety, insomnia, and irregular heartbeat?

"Everything that causes harm is prohibited, such as alcohol and tobacco. There are permissible drinks that cause no harm, like coffee and tea, and there are good drinks like milk and juices. Some soft drinks, however, cause harm and are considered extravagance."