Tim has tried to cut back from using a substance 3 or 4 times now with little success and when he does use, he tends to lose track of time and realizes he's used more than he ever intended to. Shows no signs of w/d symptoms or tolerance and his use does not seem to impact his work/social life in any significant way. What is the most likely diagnosis for Tim?
1) Substance use disorder
2) Withdrawal symptoms
3) Tolerance
4) No diagnosis can be made based on the given information