If a patent was issued to the inventor of the product, you would need a patent license from him. You can find the inventor by searching for the patent at the US Patent and Trademark Office, uspto.gov. Since nicotine is a drug, FDA clearance for the product is likely necessary and has probably been obtained. You would need to consult an attorney practicing before the FDA to determine how to find and utilize such a clearance.
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DISCLAIMER—This answer is for informational purposes only under the AVVO system, its terms and conditions. It is not intended as specific legal advice regarding your question. The answer could be different if all the facts were known. This answer does not establish an attorney client relationship. I am admitted only in California.
(Bryant) Keith Martin