It is not true that smoking weed protects you from covid, and the studies authors were very clear on that.
It is true that there are acids in weed that might be useful in treating covid, but you do not get the benefit from smoking weed.
https://www.forbes.com/sites/chrisroberts/2022/01/13/no-sorry-smoking-marijuana-does-not-protect-you-from-covid-19/?sh=33acf8aa4eee