Table 1.

Top five topics and keywords for posts from Reddit, JuiceDB, and Twitter.

Platform and topic		Keywordsa
Reddit
	1. Individual trades and vendor promotions	Liquid, size, mini, sold, brand, shipping, free, cream, retail, price, sample, purchase, list, prices, items, high, left, love, prefer, natural
	2. Flavor-related experiences and sentiments	Juice, flavor, good, flavors, vape, taste, great, juices, well, sweet, liquid, tastes, menthol, love, tank, nice, pretty, coffee, hit, find
	3. E-liquid components	Strawberry, flavor, VG, juice, vanilla, cream, custard, thanks, vapor, banana, PG, flavors, TFA, apple, mL, milk, 12 mg, bottles, menthol, 30 mL
	4. Relationship with traditional tobacco products	Tobacco, nicotine, vaping, smoking, cigarette, people, smoke, ecig, quit, products, health, product, year, electronic, know, companies, pack, stop, addiction, quit
	5. Personal experiences and questions	Time, know, well, feel, best, love, long, pretty, thought, start, find, want, favorite, give, question, experience, idea, hear, start, thanks
JuiceDB
	1. Throat hit and vapor production	Throat hit, VG, vape, coil, tank, cloud, use, RDA, PG, vapor, max VG, liquid, dripper, high, drip, vapor production, price, higher, 50/50, 6 mg
	2. Fruit and cream flavors	Sweet, like, strawberry, exhale, flavor, nice, get, really, fruit, fruity, vape, cream, inhale, taste, candy, good, tart, well, menthol, little
	3. Cream, tobacco, and seasonings flavors	Sweet, like, creamy, rich, exhale, custard, cinnamon, get, tobacco, nice, vanilla, inhale, good, banana, cream, really, caramel, vape, smooth, hint
	4. Product promotion and recommendation	Try, vape, bottle, great, juice, order, favorite, recommend, best, flavor, day, love, time, first, adv, go, would, price, amaze, definite
	5. Vaping experiences	Like, steep, try, taste, really, get, good, vape, would, bottle, don’t, much, first, got, smell, think, bit, better, still, even
Twitter
	1. Euecigban	Euecigban, eu, save, tobacco, stop, smoke, live, vaper, help, swof, try, want, people, million, smoker, please, go, via, need, product
	2. New York and noecigban	Vape, smoke, Twitter, come, pic, health, public, nyc, euecigban, cig, ad, noecigban, like, via, citi, call, propose, look, tobacco, news
	3. General discussion of e-cigarette ban	Vape, smoke, vote, blog, post, huge, electroniccigarette, consequence, citi, include, council, new, school, report, fda, house, county, harm, propose, cig
	4. Petition	Sign, vape, health, flavor, RT, want, tobacco, petitition, euecigban, say, please, support, sale, regulate, us, minor, use, propose, govern, plane
	5. Noecigban and freevape	Vape, public, noecigban, vaping, sale, smoke, place, bill, minor, freevape, new, indoor, use, would, cig, call, consider, New York, lawmaker, wale

^a PG: propylene glycol; RDA: rebuildable dripping atomizer; RT: retweet; TFA: the flavor apprentice; VG: vegetable glycerin.