is tobacco alone harmful can be bad for your health even if you are not the one smoking. Breathing in the smoke can lead to many health problems. Vaping also bad for you. E-cigarettes How tobacco harms the environment

The first component included variables describing smoking to make one feel more comfortable at social events, enjoy smoking, have more friends, and make oneself more attractive (contributed 23.5% of variance)

Theres no strict limit, but TSA officers work off the idea of personal use

Their mode of use was to place a few leaves upon coals of fire and by placing the forked end in the nostrils and the other upon the smoking leaves, to inhale the smoke until they were stupified or drunken with the fumes

(Philip Morris, the fifth of what became the "Big Five" tobacco companies, located in Concord in 1983.)

Is that a good thing

The Excludes1 edits for M54.50 are: low back strain (S39.012) lumbago due to intervertebral disc displacement (M51.2-) lumbago with sciatica (M54.4-) The parent M54 codes also have an Excludes1 edit for psychogenic dorsalgia (F45.41)