There are various things involved here. First, the US Customs regulations for importing goods which are here: http://www.americanimporters.org/pages/marketing/USimportrequirements.html
Basically, as long as you are paying import
taxes on the goods, you do not need to do anything else.
Next, if you are going to try to even remotely say this may help people quit smoking, you may need permission from the Food and Drug Administration.
You should also have a business
entity formed, likely an LLC
or a C-corp, this insulates you from personal liability and for this you should hire an attorney to draft the necessary corporate documents, get the tax id number and make all of the appropriate filings. You should also have an attorney or accountant familiar with import tarriffs and duties to keep track and pay the appropriate duties on the items coming into the country.
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