Addiction: From coffee and tea to drugs of abuse

Honestly i don't know much about drugs of abuse, but i think every kind of drug will be a drug of abuse, If you go beyond the limits. So I'm going to talk about caffeine.

Caffeine is a bitter-tasting alkaloid that block the adenosine receptors; the adenosine is a nucleotide that one of its characteristics is to stimulate the sleep, so we can conclude that caffeine inhibit the sleep.

Well about drugs i used caffeine and alcohol, but a hard drug i'm not sure, once time ago with my friends in a party I tried marijuana, but i don't know if marijuana it's a hard drug. I remember that I vomited and the next day I still did not feel well, also remember that my friends had their eyes almost closed, they did not talk coherently, they laughed 5 minutes for nonsense and walked in a weird way.

It's complicated talk about benefits of drug, cause i think everything is good in an acceptable portion. For example drugs as alcohol and caffeine are good to enjoy with friends or work more efficiently for a moment, but excessive use may lead to dependence, gastritis, diarrhea, convulsions in the case of caffeine and heart problems, damage neurons, among others, in the case of alcohol.

Examples of withdrawal symptoms can be mood swings, depression, irritability, amongst other. I don't know a person with drugs abuse, but that can be because i'm not  a very worried person about other, so maybe i'm closer to someone and I do not realize their condition.

The only impact on the career that comes to mind is to create food with dangerous additives for people or in the future certain chemicals become illegal by new research.