are cigarettes harder to quit than drugs π¬ Why do many people find alcohol?, Surprisingly, nicotine is one of the most addictive substances known. Unlike alcohol, smoking often becomes tied to everyday routines Tobacco Addiction - Philadelphia Holistic
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There is some concern that we dont really know how much aldehyde like acrolein is being generated by these modifiable electronic cigarettes. How e-cigarettes are used also adds to the confusion

Gardiner, I think this is an extremely symbolic issue and it's somewhat of a minor issue compared to the overall context of what should have been done and where we are today

Bulletin of the World Health Organization

Thats why it is necessary to ensure that actors who need to smoke on a regular basis on set are finding the best alternatives to prevent damaging their health.

They usually sort themselves out once you master the chewing method

While qualifying that statement by adding that: These associations were less precise when we restricted to those with no lifetime tobacco cigarette use, with a non-significant elevated odds of disease among those with no lifetime tobacco cigarette use