All included patients who smoked 10 or more cigarettes per day and received patches containing 21-mg nicotine plus smoking cessation counseling (JAMA Intern Med. 2015;1;175 [4]:504).
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Participants were randomly assigned to either a 21 mg. nicotine patch (n=61) or a placebo (n=54). Abstinence from smoking, alcohol and other drugs was verified by breath and urine tests.

The study was tiny and far from conclusive, but I was desperate and willing to give anything a try. The patch seemed like a big leap, though. At 7 milligrams of nicotine, it felt like too much for me.

Nicotine patches, for example. But in the case of diet patches, they typically contain herbs and teas and all sorts of compounds that have no proven effectiveness or value for weight loss.