Technically there is no such thing as an "addictive personality" - there is a genetic makeup instead.
The term "personality" is a bad one in this case because it somehow makes it sound as if they are weak in deciding to be that way, or that they have some sort of control over it.
Whereas in reality, no matter who you are, you have your own genetic makeup. You have a DNA pattern that has the layout of how sensitive to various neurotransmitters you are - how many receptors you have and such. Largely dopamine is the one that is the case of the "addictive personality" - others are obviously at play as well - but dopamine is the pleasure center and largely what controls our impulses.
The point being, you can't say "oh, no worries, I'm a strong person - shit doesn't control me, I control the world around me"
That is a lovely thought, that you have total control, but in the end, you are at the mercy of your own genetics. So at some point, you are going to find out if you are genetically going to get through it or not. You may very well be able to do whatever you like and then stop with no problems - but you might not.
As a little hint - for the most part, those that have a low sensitivity to the "feel good" chemicals, they tend to need more of them to feel it as much as "normal" people need them. They then as a result tend to seek the stuff out moreso than the "normal" person, and again, are more likely to get addicted.
I've had a grandmother die due to her addiction to perscription drugs. It is a wonderful thought to think that we are powerful and in control - and in many cases we are, or can be - but in other cases, you are simply kidding yourself to justify your actions.
That said - have fun doing what you do, because in the end, what you do is your decision (meaning starting it and ignoring warnings from those that care).
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