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.
Scrum Reference Card Excerpt: The Backlog Refinement Meeting. Most Product Backlog Items (PBIs) initially need refinement because they are too large and poorly understood. Teams have found it useful to take a little time out of Sprint Execution â every Sprint â to help prepare the Product Backlog for the next Sprint Planning Meeting. In the Backlog Refinement Meeting, the team estimates the amount of effort they would expend to complete items in the Product Backlog and provides other technical information to help the Product Owner prioritize them.