Black spots, white spots, and lumps in my mouth. not sure what it is. i've been smoking for roughly 4-5 years.

Not sure either but: Go to dentist and if he is worried by them he will send you to an oral surgeon to remove them and do a biopsy. And stop smoking! It's terrible for your health! There are many stop smoking aids and programs.

Not sure: I'm not sure either. You have to be examined to be diagnosed and treatment planned. As you are a smoker in could be anything from pigmentation to benign lesions to oral cancer, usually squamous cell. Smoking places you at high risk, especially if you also consume alcohol. Important you be seen ASAP for examination. I would recommend that you see an Oral Surgeon. Go now.

Suspicious spots?: Regardless the cause... I would advise you to have the spots and lump in your mouth examined by a dentist or dental specialist (e.g. oral surgeon, OFP). Any suspicious lump that does not resolve itself in 2-3 weeks should be evaluated. In the meantime, quit smoking.