…You don’t know the THC level in weed….
With all due respect, you don’t know what you are talking about. The THC content of weed for sale in pot clubs is clearly marked. One can buy really potent stuff, or one can buy weaker stuff. This is a result of weed being legalized. There are multiple price points at pot stores.
No one buys pot from strangers in the park. There is an underground market, but the cost of what you are buying is an indicator of its THC content.
Interesting, your expertise.