they work, it'll prolly smell a little, but not really bad since ur only makin a little. About usin more, it just depends on how strong the weed is, 2 jays worth should work if ur talkin big ones, (about 3/4 a gram each) but u might want to try 3 jays worth. The onset could be up to an hour, thats how it was for me, but some people say it hits them quicker than that.