IQOS generates a nicotine containing tobacco vapour. IQOS emits on average 95% lower levels of harmful chemicals compared to cigarettes.*
Switching completely to IQOS is likely to present less risk to your health than continuing to smoke. However, IQOS is not risk-free and is addictive. If you are concerned about the health effects of smoking, your best option is to quit tobacco and nicotine use altogether.
* Compared to the smoke of a reference cigarette (3R4F). It does not necessarily equal a 95% reduction in risk.