obsession riddle. Help to solve?

[rpand4]

I am an obsession to most, many will try but I shall never be fully mastered. What am I?

Any idea?

 

[Isis]

if this is a perv joke--s3x
if this is an anti-internet joke--internet
in my opinion it is--men

 

[Reina B]

sex
coca'cola

 

[Ameyaoo7]

I HAVE NI IDEA BUT LETS TRY IT. IS IT SMOKING

 

[Kro_boi]

rubix cube