Here are a bunch of threads for you that will answer many of your questions. Nicotine is very effective as an appetite supressant, a stimulant, a nutrient partioner, etc, etc. If you want to learn than read. If you don't read them you wont learn. All of the answers to all of the possible questions you could be asking are going to be found in somewhere in here. Some very intelligent posters with some very high level discussion over there. Posters board names Dante, Par Deus, Loki and Spook are very very credible and knowledgeable.
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