What the intake form skips: smoking and implant failure

Disclosure. Dr. Maloney has no commercial relationship with any clinic, marketplace, manufacturer, or industry body referenced in this piece. She did not receive payment, travel, accommodation, equipment, or any other consideration in connection with this piece. The publication’s standing disclosures (default: none) are documented at /disclosures/. Last reviewed: 2026-06-08.

This is the third piece in the What the Intake Form Skips series. The first covered undiagnosed diabetes. The second covered bisphosphonates and MRONJ. This piece covers smoking, which is the most prevalent modifiable risk factor for implant failure in the dental tourism patient population.

The intake form asks whether you smoke. This is a question most practices ask. The problem is not the question. The problem is what happens next.

In a domestic implant practice with adequate appointment time and an established patient relationship, a “yes” answer to the smoking question triggers a conversation. The practitioner discusses the evidence, quantifies the elevated failure risk, recommends cessation support, and may set a minimum cessation period as a condition of proceeding. Some practitioners refuse to place implants in current heavy smokers. Most at least document the discussion and ensure the patient understands what they are accepting.

In a dental tourism booking funnel, the “yes” answer on the online intake form disappears into a workflow optimised for scheduling, not for clinical decision gates. The patient arrives. The plan proceeds. Nobody mentions the smoking-implant evidence in terms that would change the patient’s decision about whether to proceed.

I am not saying this is deliberate concealment. I am saying the incentive structure does not produce the conversation.

What the evidence shows

A systematic review and meta-analysis published in the Journal of Clinical Periodontology (2019), covering 107 studies with a combined patient population in the tens of thousands, found that smokers had an odds ratio for implant failure of approximately 2.0 compared to non-smokers. Peri-implantitis risk was similarly elevated. Marginal bone loss around implants was consistently greater in smokers across multiple studies and follow-up periods.

The mechanism operates through several pathways simultaneously. Nicotine causes vasoconstriction, reducing blood supply to the periimplant tissue during the healing phase. Carbon monoxide displaces oxygen from haemoglobin, reducing available oxygen for wound healing. Tobacco smoke compounds impair neutrophil function and macrophage response, blunting the immune surveillance that normally prevents implant-site infection. The combination produces a wound-healing environment that is measurably inferior to non-smoking controls.

For the full-arch reconstruction patient — the demographic most commonly marketed to in high-volume dental tourism — the implications are multiplied. A patient undergoing full-arch reconstruction has multiple implants placed, typically combined with multiple extractions, sometimes sinus lifts, and a large area of healing soft and hard tissue. Each compromised healing unit adds to the overall risk. A single implant failure in a full-arch construction may compromise the entire prosthesis.

The dose-response relationship

The evidence is dose-dependent. Light smokers (fewer than 10 cigarettes per day) have worse outcomes than non-smokers but better outcomes than heavy smokers. The improvement with cessation is also dose- and duration-dependent: a patient who has not smoked for five years has substantially better outcomes than a patient who quit the week before surgery.

This is the nuance that is lost in the dental tourism intake process. “Do you smoke?” is answered yes or no. “How many do you smoke per day and for how long, and are you willing to cease for the entire osseointegration period?” is a different question. The first question identifies a category. The second identifies a risk profile. Only the second informs clinical decision-making.

What the marketing incentive does to this conversation

High-volume dental tourism clinics generate revenue through throughput. A patient who smokes 20 cigarettes per day and wants a full-arch reconstruction represents a very large booking fee. The clinical outcome of that treatment may be worse than in a non-smoker, but the outcome accrues to the patient months or years later, after they have returned home. The clinic does not bear the long-term consequence of an elevated failure rate the way a domestic practitioner with an ongoing relationship does.

This is not a conspiracy. It is an incentive structure. The clinic that tells a heavy smoker “we recommend you cease for 12 weeks before we proceed” loses a booking to a clinic that does not make that recommendation. The competitive pressure runs against patient protection.

What an honest consent process looks like

Before implant placement in a current smoker, the following should occur:

Quantify the risk specifically. “Your failure risk is approximately twice that of a non-smoker, based on the available evidence. For full-arch reconstruction, the practical implication is that statistically, more of your implants are likely to fail or require retreatment over a ten-year period.” Not “smoking may affect healing.” The former is informative; the latter is decorative.

Recommend cessation and document the recommendation. Minimum recommended period varies across guidelines, but one to two weeks before surgery and eight weeks through osseointegration is a common standard. Long-term abstinence has the largest effect on survival.

If the patient declines cessation and chooses to proceed: document that the elevated risk was disclosed, quantified, and accepted by the patient. That documentation should be in the treatment record.

Modify the protocol if appropriate. Some practitioners use modified loading protocols, extended healing times, or surface-treated implants preferentially in smokers. Whether these modifications close the gap meaningfully is contested, but the conversation about them should happen.

None of this is standard in the dental tourism intake and consent process.

The structural problem with “we told them to stop smoking”

Some dental tourism clinics include a smoking cessation recommendation in their discharge instructions or post-operative guidance. This is the wrong order. The conversation needs to happen before treatment, not after. A patient who has already paid a deposit, flown to the destination, and had their implants placed is not in a position to make an informed decision about whether to proceed with implant surgery given the elevated risk. They are in a position to follow aftercare instructions.

The consent conversation has a specific timing requirement: it must occur when the patient can still choose not to proceed. Telling someone to stop smoking after the implants are placed is not informed consent. It is aftercare advice.

The falsification condition

I would revise this assessment if a large prospective trial (N greater than 1,000, comparing smoking versus non-smoking dental tourism implant patients with standardised follow-up) showed failure rates no higher in smokers than the non-smoking comparison group. No such study exists in the dental tourism context. The evidence on smoking and implant failure is among the most consistent in implant dentistry. The controversy is not whether the effect exists. The controversy, such as it is, concerns the magnitude and the most effective cessation strategy.

Related reading: What the intake form skips: undiagnosed diabetes and implant failure · What the intake form skips: bisphosphonates and MRONJ · Fit to fly after implant surgery · Peri-implantitis: bone loss cascade · Why most dental implants do not need bone grafting