JUUL E Cigarettes Harrison County Health Department Vaping is NOT Harmless. Know the long term effects before it's too late! Most e cigarette liquids contain high levels of nicotine, which is highly addictive. Despite the legal age being 21, vaping devices The 101 on e Cigarettes Infographic American Heart Association Analysis suggests e cigarette use may be linked to lower rates of smoking Vaping is often marketed as a safer alternative to smoking, but many vape products contain nicotine, harmful chemicals, and heavy metals that can harm developing brains and lungs.