Addiction: From coffee and tea to drugs of abuse

One i have lived all my life with it near me is the cigarette. When i was a little kid my dad smoked, when i was in school i had friends that smoked, and we were 12 years old. Now that im older lots of my friends smoke and so do i.
 I started to smoke now that i´m 18, but the cigarette was always near me. In the start i couldn´t understand why people smoked, it was bad in so many aspects, and the first time i tried it, i didn´t feel a thing. Now that i smoke i now. It makes you feel relaxed. That simple feeling is enough to carry all the adversities it brings. I´ve tried others drugs of abuse, but i think i can´t say anything that another person that has tried it would say, and so everybody knows how those drugs are.
Talking about cigarette, the only observable effect is that you feel your body relaxed. It does not last to long, but it relaxes your whole body.
There are a lot of drugs that have benefits. The Marihuana used for medical purposes helps people to not feel that much pain. It may not cure anything, but is best that someone who´s have any disease does not feel that much pain. From Opium derives the morphine, which besides being very addictive and a drug of abuse, it have been used in hospitals as a pain killer and an anesthesic.
Abusing of drugs in most cases can be extremely dangerous. With overdose of almost any drug  (which is not always a dose so high), the person is probably dead. With alcohol you can get an ethylic coma, with cigarette you are harming your body in general, with cocaine and any other drug of abuse you are harming your body. It´s not with all drugs, but in long term of use of drugs of abuse you often see symptoms like degenerated parts of the body, which can lead into malfunctioning of it, and because of the abstinence syndrome, anxiety and the need of keep consuming the drug, which leads into drug dependence. I don´t know anyone addicted, although i know people who consumes drugs. In our society there are some commons drugs of abuse (drugs that derives from cocaine, marihuana, etc), but marihuana is almost socially accepted and it has been a very common drug, which a lot of people consume.

Your Future Job...

I think it´s important to do something you like, and with that in mind there are 2 things that i would happy working (and they have nothing in common). The first will be biochemistry, obviously i am studying biochemistry to work at one.
 I imagine it like doing research about things attached to the local problems of the place you´re working  (local in terms of country, estates, etc.) The second thing i would like to do is living of music. I don´t imagine it like a stable job, is more like playing music and just try to live with what people gives you.
In the first i wouldn´t like to travel a lot, i´d like more to just stay in a facility and work there, in any country that i consider i would like to live. In the second i would like to travel a bit more, not like around the world, but in the nearest areas and countries from Chile.
In both cases i imagine, and would like to just get enough money for the living, with the difference that one would be a stable play, and the other would not. Also i would expect to live in different ways depending on those jobs.
I would like to do a biochemistry major, cause if i keep studying biochemistry i would like to get to the grade of PhD.