I know what you mean with this; I had a similar thing when I got stoned for the first time. It isn't an addiction, it is more a psychological thing where you find that you like the expereince and want to repeat it. I don't readily have access to pot, so it doesn't matter too much, but I think if anything, it might be a sign of an addictive personality, in which case just be aware of it. But there is no way you can become an alcoholic just from your first drink, it is something that builds up over time, on the other hand, some people may have a greater disposition towards substance abuse problems, and addictive behaviours in general.
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