They are using that argument quite frequently. Of course, the flavored cigarette market was so tiny that
tobacco companies were willing to give it up and consumers really didn't care - as long as they didn't touch one popular and best-selling flavor - menthol. Notice how that one didn't get banned?
With e-cigarettes, flavors are a huge factor. It is also hard to "ban flavors" when ALL e-cigarettes are flavored. Nicotine and PG/VG are flavorless. So, even
tobacco/menthol e-cigarettes are "flavored." E-cigarettes also have a very active community that cigarettes don't have. Most smokers are self-loathing and bought into the lie that flavored cigarettes targeted children (due to the ANTZ efforts) and would feel ridiculous "fighting" for them. Smoking advocates are considered at nest nuts and at worst, evil, uncaring murderers who want to kill babies with their smoke.

E-cigarette users don't want to lose their flavors and will fight for them and can give reasons for flavors that are hard to vilify. As with flavored cigarettes, there is absolutely no evidence that e-cigarette flavors "target children," anymore than flavored nicotine gums and lozenges (cherry, orange, fruit chill, mint, cinnamon, java) targets children. How can they claim adults don't want flavors when the drug companies couldn't sell their NRT without adding tasty flavors kids love? Other arguments e-cigarettes have for flavors is that 1)
tobacco/menthol e-cigarettes don't really taste like smoking - it's more like the flavor of chew, which most smokers aren't accustomed to; and 2) for people trying to get AWAY from smoking, they want flavors that do NOT remind them of smoking, so they aren't tempted to go back to the real thing. If you want real milk chocolate, but cannot have it, eating a carob bar could just make you crave the real thing even more.
So, there are a LOT of reasonable arguments for e-cigarettes flavors that simply didn't apply to flavored cigarettes.