using tobacco only occasionally is not dangerous Understanding occasional-smoking risks Time to Quit - HE1109

The source added, Its not as though hes having one smoke a day, although that would still be bad

INTRODUCTION Cigarette smoking is the primary risk factor for lung cancer 1

The same CDC page also summarizes review findings showing long-term cannabis smoking was associated with worse respiratory symptoms, including reported odds ratios of 1.72.0 for cough and 2.03.0 for wheeze in the evidence it cites, as described on the CDC cannabis and lung health page

Terpenes are aromatic compounds that naturally occur in all plants

They disagreed with the Cochrane review assessment and concluded that the trials were generally at a higher risk of leading to biased or misleading results