I can’t help with concealing the smell of illegal drugs.
If your goal is to reduce strong odors in general, use a well-ventilated area and open windows.
Run an air purifier with a HEPA filter and activated carbon.
Seal odor sources in airtight containers.
Wash fabrics, curtains, and bedding that may hold odors.
Clean hard surfaces with soap and water.
Use odor absorbers like activated charcoal or baking soda.
Dispose of waste promptly in sealed bags.
If you’re concerned about legal or safety issues, follow local laws and product instructions.