I think u didnt understood right. You must smoke the boiled weed. The 'tea' will NOT make you stoned, because the THC and the another cannabinoids are NOT soluble in water. So, boiling the weed will not made it lose any important stuff.

But, if you "Extract the dried cannabis with a suitable solvent for several hours at room temperature or by refluxing", then the THC and the cannabinoids will be extracted to the suitable solvent (ethanol, chloroform, ether), and obviously the weed will lost its potency.