Cases of word usage

1) a tiring job; a cigarette (fag)

2) held or done by, belonging to, two or more people together; a cigarette containing a drug (joint)

3) a visible gas coming from a burning substance; (an act of smoking) a cigarette etc (smoke)

4) a short remaining end of a pencil, cigarette or similar object; to hit (one's toe) against something accidentally; to put out a cigarette etc by pressing it against something hard (stub)