CIGARETTES CONTINUE to be the only lawful product sold that, even when used as intended, are still guaranteed to cause heart and blood vessel disease, cancer, severe lung disease, and compelling disability. The study cited in the article “Nicotine aids found not effective long term’’ (Metro, Jan. 10) suggests that nicotine replacement therapy may not be highly effective. However, the research may simply be pointing out how incorrectly these products are being used, and that to use them without professional support and guidance or with half-hearted effort or inadequate counseling and follow-up is, like anything else, a matter of getting out of it what you put into it.