> An individual with a disability is defined by the ADA as a person who has a physical or mental impairment that substantially limits one or more major life activities, a person who has a history or record of such an impairment, or a person who is perceived by others as having such an impairment.

I’m not sure nicotine addiction fits the bill, what major life activities does it substantially inhibit?

https://www.ada.gov/cguide.htm#anchor62335