John Kreis is worried that his business could go up in a puff of smoke. Kreis, the co-owner of the Old Port Vape shop in Portland, said efforts to regulate vaporizers or electronic cigarettes could cripple the industry, which is now dominated by small nicotine liquid manufacturers and shops like his. Kreis said vapes, as the devices are known, are an innovative way to either allow people to continue to smoke and get nicotine into their systems, or as a way for smokers to wean themselves off traditional cigarettes.