The primary objectives of this study are: •to compare ONS (two sprays of 1 mg nicotine) and NiQuitin lozenge 2 mg after 5 hours of witnessed abstinence with respect to urges to smoke during the first 5 minutes after start of treatment., and •to compare ONS (two sprays of 1 mg nicotine) and NiQuitin lozenge 4 mg after 5 hours of witnessed abstinence with respect to urges to smoke during the first 5 minutes after start of treatment.