(CNN) Oregon health officials are investigating a death from severe respiratory illness that could be linked to vaping, according to an announcement made Tuesday by the Oregon Health Authority.

The individual in Oregon, who died in July, had recently vaped products containing cannabis purchased at a dispensary, according to the announcement.

Last month, the Illinois Department of Public Health announced the first such death amid a growing number of similar lung illnesses across the country.

Health officials say it's unclear whether there's a connection between cases, whether vaping definitively caused these illnesses and what components or chemicals of e-cigarettes might be responsible.

"We don't yet know the exact cause of these illnesses -- whether they're caused by contaminants, ingredients in the liquid or something else, such as the device itself," Dr. Ann Thomas, public health physician at Oregon Health Authority's Public Health Division, said in a statement.