<qa>  How many cigarettes are consumed daily during at least one year preceding inclusion?Fifty 50 healthy male or female subjects between the ages of 19 and 50 years, inclusive, smoking at least 20 cigarettes daily during at least one year preceding inclusion. Multiple doses of all study treatments are given either every 60 minutes or every 90 minutes, respectively. All products will be administered in accordance with labeling, on five separate treatment visits. The subjects will abstain from smoking from 8 pm in the evening before and until the end of each visit. 