You see me float, atop the foam, not sink, as you think I should. What am I?

I have a beam but am not a structure; The equilibrium of all things to prevent rupture; Losing me could lead to fall; But no trees or leaves make me up at all.

First three is a store, but not one of play. Complete: of your eye, or fell from a sway. A doctor repellent. Poison, Snowy’s dismay. ‘Round, thanks to a man, spread my hosts on his way.

I crown a candle, carry me and I'll show you the way. But be careful with me at night, for one puff is enough to scare me away, and then in the dark you'll stay.

I’m found on clothes but also in play, You chase your friends in a fun display. A little label or a game to brag