Revise definitions in Clean Indoor Air Act

Added 'trains, buses, and other forms of public transportation' to the list of enclosed public places where smoking and vaping are banned.

Removed the redundant word 'including' from the definition of 'smoking' to improve clarity.

The definition of 'electronic smoking device' was updated to explicitly include dab rigs and vape pens, ensuring these products are covered by smoking bans.

The definition of 'bar' was modified to explicitly include casinos alongside taverns and night clubs.

The definition of 'incidental to the service of alcoholic beverages' was changed from a 60% income threshold to a 50% threshold for classifying a business as a bar.

Community college facilities and facilities of the Montana university system were added to the list of enclosed public places where smoking is prohibited.

The effective date of the act was changed from the beginning of the legislative session to immediate upon passage and approval.

The definition of 'electronic smoking device' was updated to explicitly list 'e-cigarette, dab rig, or vape pen' to remove ambiguity about which products are covered.

The definition of 'smoking' was modified to include 'inhaling, exhaling' and the use of 'an electronic smoking device,' broadening the prohibited activities.

The numbering for the definition of 'enclosed public place' was adjusted from a single item to items (3)(4), likely to accommodate the new content.

The bill number was updated from LC 3855 to SB 390, and page headers were changed to reflect the official Senate Bill designation.