I think in smoking cessation research in this group we should assure them about security and safety our work.I suggest at the first step pay attention to their feeling and motivation about smoking cessation.
I agree with Zahra, that the motivation of the work is to help those people who want to quiet smoking and that all data will be handled not to violate their privacy. I suggest you read the information at the ethnics website for Columbia University (link provided). I also recommend you read the main reason behind fear of the medical community by African Americans (link provided)