A systematic review of nicotine replacement therapy indicated that this approach is​

A) ​less effective than a placebo.
B) ​more effective than a placebo.
C) ​about as effective as a placebo.
D) ​more effective after 4 years than 3 months.

Nicotine Replacement Therapy

A method used to help people stop smoking by providing nicotine in forms other than cigarettes.

Systematic Review

A comprehensive summary of research findings on a particular topic, following a strict methodology to critically analyze and synthesize data from multiple studies.

Placebo

An inactive substance or condition that has the appearance of an active treatment and that may cause improvement or change because of people’s belief in the placebo’s efficacy.