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Last updated: April 8, 2026

Quick Answer: IQOS is generally considered to be a less harmful alternative to smoking traditional cigarettes, as it heats tobacco instead of burning it, reducing the levels of harmful chemicals. However, it is not risk-free, and long-term health effects are still being studied.

Key Facts

IQOS heats, not burns, tobacco, leading to lower levels of harmful chemicals compared to cigarette smoke.
Studies suggest IQOS emits significantly lower levels of toxicants and harmful compounds.
Despite reduced harm, IQOS still delivers nicotine and is not risk-free.
Long-term health impacts of IQOS use are not yet fully understood.
Public health organizations acknowledge it as a potential harm reduction tool but emphasize quitting all tobacco and nicotine products as the best option.

Overview

The debate surrounding the safety of IQOS (I Quit Ordinary Smoking), a heated tobacco product developed by Philip Morris International, is complex. Unlike traditional cigarettes that combust tobacco at high temperatures, IQOS utilizes a heating blade to warm tobacco sticks to a precise temperature, releasing an aerosol containing nicotine and flavorings without combustion. This fundamental difference forms the basis of claims that IQOS is a less harmful alternative to smoking.

Proponents highlight that by eliminating burning, IQOS significantly reduces the production of harmful and potentially harmful constituents found in cigarette smoke, such as tar and carbon monoxide. This has led to its classification by some as a harm reduction product, intended to offer adult smokers a viable option if they cannot or will not quit nicotine entirely. However, it's crucial to understand that 'less harmful' does not equate to 'safe,' and the long-term health implications of inhaling heated tobacco aerosol are still a subject of ongoing research and public health scrutiny.

How It Works

Tobacco Heating System: At its core, IQOS employs a sophisticated electronic device that heats specially designed tobacco sticks, known as HEETS or Parliament HeatSticks. This heating process occurs at temperatures typically between 300°C and 350°C, significantly lower than the approximately 600°C reached during cigarette combustion.
Aerosol Generation: Instead of smoke, IQOS generates an aerosol. This aerosol contains nicotine, flavorings, and a host of other substances, albeit in different quantities and types compared to cigarette smoke. The aerosol is inhaled by the user.
Nicotine Delivery: The primary active compound, nicotine, is released from the heated tobacco, providing the addictive effect that users seek. The concentration and delivery of nicotine are designed to mimic that of traditional cigarettes.
Reduced Harmful Chemicals: The elimination of combustion is the key to the reduced harm claims. Burning tobacco produces thousands of chemicals, many of which are toxic and carcinogenic. By heating, IQOS significantly reduces the levels of many of these harmful chemicals, including tar, carbon monoxide, and various carcinogens.

Key Comparisons

Feature	IQOS	Traditional Cigarettes	Electronic Cigarettes (Vapes)
Heating Method	Heats tobacco	Combusts tobacco	Heats e-liquid (nicotine, flavorings, propylene glycol, vegetable glycerin)
Primary Substance	Real tobacco	Real tobacco	E-liquid
Combustion Byproducts	Significantly reduced	High levels of tar and other harmful chemicals	Minimal to none
Nicotine	Delivered	Delivered	Delivered (variable concentrations)
Harm Potential	Considered less harmful than cigarettes, but not risk-free	Highest harm potential among the three	Considered less harmful than cigarettes, with harm potential varying by e-liquid composition and usage patterns

Why It Matters

Impact on Public Health: The advent of products like IQOS has prompted a re-evaluation of tobacco harm reduction strategies. Public health organizations, while generally recommending cessation of all tobacco and nicotine products, acknowledge that for some adult smokers who are unwilling or unable to quit, heated tobacco products may represent a less harmful alternative.
Chemical Profile Differences: Scientific studies, including those by the manufacturer and independent researchers, have consistently shown that IQOS aerosol contains significantly lower levels of harmful and potentially harmful constituents (HPHCs) compared to cigarette smoke. For instance, levels of carbon monoxide and acrolein are dramatically reduced.
Long-Term Health Uncertainty: Despite the promising reduction in certain harmful chemicals, the long-term health consequences of inhaling heated tobacco aerosol are not yet fully understood. The aerosol still contains nicotine, which is addictive and has known cardiovascular effects, as well as other compounds whose long-term impacts require further investigation. It's also important to note that IQOS is not intended for individuals who have never used tobacco or nicotine products.

In conclusion, while IQOS offers a potentially less harmful pathway for adult smokers seeking alternatives to combustible cigarettes, it is imperative to recognize that it is not a risk-free product. The cessation of all tobacco and nicotine use remains the most effective way to protect one's health. Further research is essential to fully understand the long-term health implications of heated tobacco products, and regulatory bodies are continuing to assess their role in the evolving landscape of tobacco control.