Chris Brown gives our child Royalty asthma with his weed - Baby mama

Chris Brown's baby mama claims their 1-year-old Royalty has developed asthma because the 26-year-old singer has exposed her to an extreme amount of secondhand smoke, TMZ reports.

According to the publication, Brown is a weed and tobacco enthusiast.

Nia says when Royalty comes back from a visit with Chris she usually reeks of smoke.

Nia wants to restrict Chris' visitation ... asking judge to force him to hire a full-time nanny or pull back on his right to be around the child.