I found this article below, it supports my own personal experience that cigars relax you, but stress may come back later.
Neurobiological Effects of Smoking Tobacco
Neurological Effects of Nicotine, Tobacco, and Particulate Matter - Neuropathology of Drug Addictions and Substance Misuse - Chapter 11
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Tobacco is an addictive substance that produces both rewarding and negative effects, a combination of which ultimately leads to tobacco use, relapse, and dependence. The positive reinforcing effects of tobacco are involved in the initiation stage of dependence and include mild euphoria, increased memory, and relaxation, while the negative effects of smoking are associated with cessation or withdrawal and include depressed mood, anxiety, and impaired memory (see Wise, 1996*; *Wise and Koob, 2014, for review). Like all drugs of abuse, nicotine, cigarettes, and tobacco products affect the mesocorticolimbic reward pathway, the major pathway in the brain for reward and reinforcement for addictive drugs as well as natural rewarding stimuli (Volkow, Fowler, Wang, Swanson, & Telang, 2007). This pathway comprises cell bodies in the ventral tegmental area (VTA) and their projections to the nucleus accumbens (nAcb) and prefrontal cortex (PFC) (Figure 1). Central to the classical neurobiological model of addiction is the release of dopamine (DA) in the nAcb following stimulation of this pathway, which is associated with reward, reinforcement, and the initiation of drug abuse (Volkow et*al., 2007). Both nicotine and tobacco smoke induce increases in DA levels in the nAcb through the binding of nicotine to nicotinic acetylcholine receptors (nAChRs) in the VTA. Persistent smoking, like with other drugs of abuse, leads to tolerance and withdrawal after cessation. Both the positive hedonic effects and the avoidance of negative withdrawal effects contribute to tobacco dependence. With repeated use, the positive reinforcing effects become reduced and the mechanisms involving negative reinforcement increase. There is also evidence for neuroadaptive changes occurring with a switch from ventral striatal (nAcb) to dorsal striatal centers linked to a loss of control of drug use. Human smokers also have reduced DA function and reduced DA transporter availability compared to nonsmokers. For a review of neuroadaptive changes in human smokers see Martin-Soelch (2013).
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Part of the problem I see with many studies is that they concentrate of cigarettes that have many added chemicals, and not natural cigars.
I have read that unless a cigar is labeled "organic" one should not assume it to be additive free.
The largest most encompassing study ever done was in the late 1960's-early-1970's, and the mortality rate of up to five cigars a day smokers was the same as the general population.
That does not mean there are not other negative affects, just that they don't kill you right away.
The legacy of prescription drugs isn't any worse than that of cigars in my opinion.
I'd still take a cigar over most pills handed out like candy at a doctor's office.