Mystery burnt/cigarette smoke smell in bathroom

Over the last month, I have noticed a burnt smell in our master bathroom that reminds me most of cigarette smoke. It is definitely not cigarette smoke. No one in our household smokes and our house is next to an empty lot so it is not neighbors who are smoking outside. It is a faint smell but I notice it every time I am in the bathroom. Our house was built about a year ago but I started noticing the smell about a month ago. Any ideas what this could be?

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