Actually, no, an e-cigarette does not have the potential to emit harmful particles. The health board appears to be confused over the difference between smoke and vapor. Smoke is created when a substance is burned. The process of combustion creates harmful tar, poisonous gasses such as carbon monoxide, and particles of ash. When tobacco is burned, about 4,000 new chemicals are created, many of which are toxic or carcinogenic. In contrast, vaporization is a physical process, not a chemical process like combustion. No particles are created, and no new chemicals are created. It's a basic rule of physics: vaporization changes the state of matter from a liquid into a gas. The liquid begins with 3 simple substances that are generally recognized as safe (GRAS) by the FDA: propylene glycol (the chemical used in fog machines), water, and flavoring. Nicotine is optional. If present, it makes up perhaps 2% of the 1/4 teaspoon of liquid in the cartridge. The nicotine is 99% absorbed by the user before being exhaled. Bottom line: vapor is not dangerous to bystanders. Effect on users? Over 90% of consumers report improved breathing, lung function, and stamina. For links to surveys, research, and lab tests visit casaa.org.