not sure where you read those figures...but i dont think they're entirely accurate....
according to the research papers ive read on it, the thc intake benefit is slightly higher than smoking....the primary reasons for using them are little to no smoke (when used properly) and the fact that not as much ""drifts away" so to speak...
if i ever go back to tweeds though, it'll be with a vapo
probably homemade though..(no not cheapo homemade, my roommate is a mechanical engineer working on his doctorate....think better than Volcano quality, and built for around $100 tops)