Tooth 30 extracted. Thinking about implant or bridge. Input?

If your adjacent teeth are healthy, forget about the bridge,and make an implant,there is no problem about what your habits, as long as you keep the area clean and healthy,

its a very easyand quick proceedure,my recomendation is just to make it in a 2stage proceedure.

Smoking is not an absolute contraindication for dental implants especially on the lower arch.  I am more concerned with 5-10 drinks a night that is excessive and may cause problems with sugar/insulin control as well as general health.  High alcohol use can affect your liver and both smoking and alcohol use increase your risk of oral cancer as well as throat and lung cancer.

If your overall health is good you would still be able to do an implant or a bridge but I suggest you  let your dentist know about current usage.  

Replacing a missing tooth is one of the most beneficial oral health decisions you can make. Not only does a gap in your smile detract from your appearance, leaving that gap in place dramatically increases your chances of losing an adjacent tooth.

Suffering from bruxism will not limit your options for tooth replacement, unless yours is severe. If you do so, i will recommend seeing a neuromuscular dentist to evaluate this problem for you, since they are experts on this matter. Smoking can delay healing process and sometimes make patients not be a good candidate for it,but truly the best answer you are going to get is from a board certified surgeon. You can always go for a consultation to go over this questions you have about implants ( healing time, money, etc). 

A fixed dental bridge is an artificial replacement tooth (pontic) anchored to dental crowns on the adjacent teeth to hold it in place. Fixed dental bridges can be successful, but because they do not replace the root of the missing tooth, they do not solve the problem of jawbone deterioration.

Dental implants, on the other hand, are a permanent tooth replacement solution. Dental implants prevent jawbone deterioration because the pontic is attached to an artificial tooth root that is actually implanted in the bone. Dental implants also do not increase your vulnerability to tooth decay as bridges sometimes can.

Again, go for a consultation with a surgeon to go over details about implants. I hope this was helpful