Bongs will filter out water-soluble gases or components of the marijuana smoke, the water will also filter out a negligable amount of THC from the smoke. The study you reference was performed by MAPS but used NIDA supplied marijuana, grown by the govnerment and about as potent as brick weed (if not weaker).
If you enjoy smoking out of a bong don't stop due to the results of one study.
Nullific Reviewed by Nullific on . do bongs really filter what they are supposed to? i keep reading that bongs filter out thc. is this true? becuz i thought thc is non-watersoluble. Rating: 5