OK, lots of stuff can make your ears ring. You're wifes' voice for instance... Anyway once you've got it, it probably ain't going away. As a pharmacist I can assure you that unless your shoving the Q-tip in far enough that it protrudes from the other side of your head, or if your're leaving it hanging it out of your ear throughout the day, or using it to pack the wax deeper into your ear canal instead of gently swiping the external components of your ear, a Q-tip will not influence your hearing, ringing or otherwise. And those of us who occasionally need to look at your ear canal appreciate the use thereof.
Many chemical substances can and do affect nerve conduction, which will influence anything served by a nerve, including your ears. Live life, eat, and drink, what you enjoy in moderation, exercise regularly, and relax, don't sweat the small stuff.
If indeed prevention of tinnitus is the goal, it will need to begin at childhood and be maintained throughout your life. When you make your kid mow the yard they need to wear hearing protection... every time... subjecting the poor child to the ridicule of every other kid that rides by on their bike. You'll need to throw the i-pod in the toilet, but AC/DC, or Merle Haggard in my case, sucks if it ain't cranked, and always, always, always wear hearing protection when around gunfire, hunting or otherwise. So, in a nutshell, prevention isn't practical for most of us, and by the time we consider it necessary it's usually too late. It's not treatable by current medical standards and it's a great excuse to ignore things you'd rather not hear. Peace be with you, or at least a pleasant, high pitched, harmless humm...