My american classmate showed me that trick :D
Its hardly 5 mins work :D
For me,rolling joints is too much work. Back in uni i was a bong guy,the easiest and the most convenient way to smoke weed/hash,also it is easy to assemble one almost anywhere.
Smoking pure hash,well stick a chewing gum on the table and stick a neddle on it..at the other end of the neddle attact a tiny lump or hash,light it up and cover it up with a glass and let the fire die and the glass is filled with smoke.
That's how i did it in lazy days.
Ive been smoking weed for a long lng time,occasionally these days :D But there was a time i would be doped 24/7 for a month or so. By doped i mean a lot of other stuff and weed.
Btw never seen anyone get addicted to,never noticed any withdrawal symptoms in me or other users.