Correct, cigar really is an obstruction regardless if it has been smoked and discarded or brand new. However, chips may be either loose impediments or obstructions depending on the way of manufacture. Chips whittled by an idle boy scout are loose impediments as they have not been made for any spesific purpose.
On many courses manufactured wood chips are used to protect newly planted trees or as path coatings. By definition these chips are obstructions. Although on some courses they have been declared as integral parts of the course or loose impediments by a Local Rule.