Is weed getting stronger or are my friends getting funnier?
I dunno man, how strong was the weed you used to smoke? Also, it is 2018 - you should probably think about switching to vaping.
When people talk about cannabis strength, they’re usually referring to the percentage of THC instead of CBD. There are some studies on the topic of cannabis potency over the years, but the samples used were likely not from your personal stash. So sure, these studies are interesting, but they probably won’t solve your mystery.
At the end of the day, don’t overthink it - just get cannabis from a trusted and legal supplier, read the label and always start low and go slow when trying a new strain or product.
And as for your friends - we’re sure they’re hilarious.