Nicotine at very low levels (10 nM - 100 uM) enhances synaptic transmission. Since the neurons affected are in the striate cortex and participate in the reward pathways it maybe that this partly explains why nicotine is addictive.
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Someone with nicotine addiction can call plenty of local or state based helplines with help quitting their addictions. You can also get help and find useful information through websites such as Whyquit and Quitsmoking.
well buy some packs and try on your own, u should learn to inhale before 3-4 packs and then go from there