A Believer but Friends Doubt it’s Real

I was skeptical at first until I tried it and realized thc-a is the same thing as regular weed. But my friends that tend to smoke a lot on a daily basis all keep telling me it’s not the same. I bought an oz from LIT and gave some to three people for Xmas gifts and they were like “ oh this is that thca stuff”. They can’t prove anything and refuse to listen to facts. Any suggestions for what to tell them?