A divorce may be granted for any of the following grounds: (1) failure to consummate the marriage at the time of the marriage and continuing at the commencement of the action;
(2) adultery;
(3) conviction of a felony;
(4) wilful desertion for a period of one year;
(5) either (A) cruel and inhuman treatment calculated to impair health or endanger life;
(B) personal indignities rendering life burdensome; or
(C) incompatibility of temperament;
(6) habitual gross drunkenness contracted since marriage and continuing for one year prior to the commencement of the action;
(7) [Repealed, § 68 ch 127 SLA 1974.] (8) incurable mental illness when the spouse has been confined to an institution for a period of at least 18 months immediately preceding the commencement of the action; the status as to the support and maintenance of the mentally ill person is not altered in any way by the granting of the divorce;
(9) addiction of either party, subsequent to the marriage, to the habitual use of opium, morphine, cocaine, or a similar drug.