Yes it still harmful because it is air pollution to your lungs. My kid's pediatrician used to tell me that I should change my clothes after smoking a cigarette and before I carry my baby.
In Scrum, a product backlog item (PBI, backlog item, or item) is a unit of work small enough to be completed by a team in one Sprint iteration. Backlog items are decomposed into one or more tasks. See also backlog effort estimation unit.
The Sprint Backlog is the list of work the Development Team must address during the next Sprint. The list is derived by the Scrum Team selecting Product Backlog Items from the top of the Product Backlog until the Development Team feels it has enough work to fill the Sprint.