Smell adverbs are provided in this article. The words listed here are commonly found along with the verb smell in sentences. This reference page helps answer the question what are some adverbs that describe or modify the verb SMELL.
actually, badly
practically, probably
really, strongly
sweetly
Hope this word list had the smell adverb you were looking for. In addition to adverbs used with smell, other example verb adverb pairings can be found on this site.
malodorously