This is an explorative study comparing new prototypes of Nicotine Replacement Products with Nicorette® gum.

This study included 40 subjects who were randomly assigned to one of eight treatment sequences. In four of the sequences, the three prototypes with the shorter dissolution time and the reference were used; in the remaining four sequences, the three prototypes with the longer dissolution time and the reference were used. Hence, half of the subjects received the Short prototypes and half received the Long prototypes. Subjects in both treatment groups (short and long) attended four treatment visits, each of 11 hours' duration, and periods of at least 36 hours' duration between treatment visits.

Inclusion Criteria:

• Healthy smokers, smoking at least 10 cigarettes daily during at least one year preceding inclusion and BMI between 17.5 and 30.0 kg/m2.
• Female participants of child-bearing potential are required to use a medically acceptable means of birth control.
• A personally signed and dated informed consent document, indicating that the subject has been informed of all pertinent aspects of the study.

Exclusion Criteria:

• Pregnancy, lactation or intended pregnancy.
• Treatment with an investigational product or donation or loss of blood within 3 month preceding the first dose of study medication.