RIDDLE ME RIDDLE ME

SOLVE THI RIDDLE AND SEND ME THE ANSWER
it can break what beats in yourself if wrongly used
it can make you cry
it makes you feel ontop of the world
it is a harmless drug
you could end up in it if your not carfull
what is it?

try this one
it follows but cant be heard
it is not living yet it walks
it can ofer shelter from the daytime star
what is it