Keep in mind these requirements are distinct; you may go well over the 4,500 hours but still not meet the duration requirement if those hours were not spread over a three-year period. For example, assume you worked on two projects at the same time, over a two-year period.
Nicotine is the main ingredient of concern in smokeless tobacco. It is estimated that a normal, 30-minute dip of smokeless tobacco delivers the same amount of nicotine as 3-4 cigarettes. Nicotine affects the brain and central nervous system and changes neurotransmitters levels regulating mood, learning, alertness, and ability to concentrate.
Long Term Effects of Crack on the Body. Smoking crack can have a lot of long term effects on a userâs body, and most of them are related to the smoking aspect itself. Long term effects of crack smoking include things like cancer of the lungs, throat, or mouth, and respiratory diseases related to inhaling smoke. Smoking a crack pipe can also cause burns and blisters on a personâs mouth, lips, or fingers, which could lead to permanent scarring or marks.