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In other words, male smokers smoke 19.6% more number of cigarettes than female smokers

Always on (no on / off switch)

Spirit Airlines : Spirit allows vapes to be packed in carry-on luggage or carried in pockets, but notes that some countries (e.g., Dominican Republic) prohibit the carriage of these devices in carry-on baggage, checked baggage, and/or on ones person, in which case Spirit will abide by such regulation. So research the rules in your destination country before packing vapes

This work is supported in part by Extension Implementation Grant 2017-70006-27140/ IND011460G4-1013877 from the USDA National Institute of Food and Agriculture