1. Difficult To Inhale:- Electronic cigarettes are difficult in inhaling. - Smokers have to suck it very strongly to attain the required level of nicotine. - The nicotine inside the cartridges is addictive. - According to the research made in California University, the density of aerosol dropped after the first few puffs. -The smoker therefore requires stronger suction to produce the aerosol. This strong suction may lead towards lungs damage.- When you stop using it, you can get withdrawal symptoms including feeling irritable, depressed, restless and anxious.- It can be dangerous for people with heart problems.- It may also harm your arteries over time.

2. Question ingredients:- Most of the companies add some harmful chemicals in it. - They are dangerous for smoker health. Like diethyl glycol which is anti freezing agent. - This chemical may lead to respiratory problems. - Nitrosamine can cause cancer.- Nicotine can affect brain development in children and teens.- Drummond says, Some e-cigarettes have candy flavoring, which could make them appealing to kids.- They don't leave a smell like tobacco. So it's harder for parents to know if their kids are vaping.- If the cigarette breaks accidentally, the users will be exposed to these harmful components.

3. Increase in airway resistance:- They found that using an e-cigarette caused an instant increase in airway resistance that lasted for 10 minutes in the majority of the participants. - Non-smokers - even among lifetimes non-smokers, using an e-cigarette for ten minutes raised their airway resistance to 206% from 182% (mean average); the researchers described this as a "significant increase".- Current regular smokers - among existing regular smokers, the spirometry tests revealed a significant rise in airway resistance to 220%, from 176% after using one e-cigarette for ten minutes.- COPD and Asthma patients experienced no significant increase in airway resistance from using one e-cigarette for ten minutes.