Why do you guys think it is impossible to smoke 10-20 joints a day? maybe they are dealers (not saying they are) and they have plenty. Or maybe they just have a lot of stoner friends who come over or they go visit. Or maybe they are wealthy and can afford such things. I dont know their situations, All Im saying is that it is not impossible to smoke that much in 1 day.
Me myself, I smoke about 4-5 j's on a weekday and on the weekend I try to maintain a high at all times.