I'm 18 and for the past year and a half i have been smoking a pack and half every week, i managed to quit but was that time i spent smoking enough to increase my risk of cancer despite not having family history of any kind of cancer?

any smoking is dangerous but a pack and a half a week isn't that much compared to a pack a day. if you have any white spots on lips , cheeks or tongue than see an ORAL SURGEON for an exam or possible biopsy. make sure you quit for good any more smoking is high risk for oral cancer.

It is good that you quit using tobacco. You did enhance your risk for cancer to a small extent, however, if you abstain from tobacco, the risk will subside with time. For healthy diet: http://www.choosemyplate.gov/., exercise 30 minutes/day, drink enough water daily so your urine is mostly colorless, have safe sex, no tobacco alcohol weed or street drugs. Get HPV and Covid vaccines.