Following trends in behaviors such as smoking is more easily accomplished using rates, because population sizes can change due to natural increase or decrease or in- or out-migration and a prevalence allows a relative measure of the problem
The generally light nature means that they don't have a lot of the harsh flavors found in ordinary cigarettes, and the odor is less noticeable too
Our psychological triggers may include such things as the habit of smoking while talking on the phone, driving a vehicle, working, upon waking, before going to bed, when leaving a store, when around other smokers, while drinking, surrounding romance, when alone, after meals, during celebrations, when sad, during stressful situations, during other specific emotions, or upon visiting specific locations (garage, porch, garden, in-laws, bathroom)
Although long-term data is still being gathered, some studies indicate that e-cigarette use could lead to lung damage, and public health officials are still debating its overall safety
