Larger instruments (up to 150 inches total linear dimensions and 165 pounds) may require purchasing an additional seat or be checked, subject to standard checked bag fees
Factors likely to be important include the type of e-cigarette product (first-generation versus second- and later-generation devices), the frequency of use (daily/regularly or not), the method of use (complete switch to e-cigarettes versus dual use), and the goal of use (to quit smoking versus primarily to reduce number of combustible tobacco cigarettes smoked or otherwise reduce harm without quitting)
3) How does it help keep tobacco fresh
They can have 2 to 4 generations in a season, overwinter in the soil, and emerge as a moth again during the next growing season
Most of its activity seems to stem from uncharacterized, weakly acidic compounds
Department of Health and Human Services.The Health Consequences of Smoking50 Years of Progress: A Report of the Surgeon General