Uma mentioned methods we've had to confront. So here are my favorites:
Ad hominem attacks:
Anyone who uses ecigs is a nicotine addict in denial about their addiction. (Implication: Therefore their opinions are meaningless.)
Vapers who write to their regulators/legislators in suport of ecigs are shills for
ecig manufacturers/vendors. ("astroturfing")
The Straw Man fallacy (committed when a person simply ignores a person's actual position and substitutes a distorted, exaggerated or misrepresented version of that position.) For instance:
Person A (vaper) has position X. "Vapers prefer non-tobacco flavored e-juice, such as strawberry."
Person B (ANTZ) distorts this to position Y. "Children like strawberry. Therefore strawberry-flavored ecigs will attract children."
Person B then attacks based on position Y. "Ecig manfacturers are selling strawberry-flavored ecigs to attract children to
vaping."