Mainstream smoke is that which is caused by the lighting of the cigarette, and side stream smoke is the smoke inhaled by the smoker.
(Mainstream smoke; is; that which is caused by the lighting of the cigarette) (that; is caused; by the lighting of the cigarette) (side stream smoke; is; the smoke inhaled by the smoker) (the smoke; inhaled; by the smoker)
Mainstream smoke that side stream smoke the smoke
is is caused is inhaled
that which is caused by the lighting of the cigarette
by the lighting of the cigarette
the smoke inhaled by the smoker
by the smoker