A group of vape shop owners is backing a newly filed lawsuit challenging Denver's ban on flavored tobacco products, arguing the ordinance is unconstitutional and unfairly targets their industry. (KDVR) Opponents of Denver Flavored Tobacco Ban Voice Concerns In what is being called one of the city's most expensive races on this year's ballot, Denver voters are leaning heavily toward keeping the city's ban on the sale of flavored tobacco, Colorado Flavored Vape Ban Voted Down in Big Loss for Prohibitionists